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W212 E63 (UK) Idle RPM increase in different drive modes?

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Old Jun 14, 2025 | 09:04 PM
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W212 E63 (UK) Idle RPM increase in different drive modes?

Hi all!

My question is the above really, but would only apply to the UK variant (RWD-only). When choosing sportier drive modes, to the idle revs increase? I can see this happens on the R231 SL63, but am hoping it happens on the E63 so I can use the extra space.

Thank you!
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Old Jun 14, 2025 | 10:08 PM
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It happens to some of the e63's but not all of them, doesn't happen on mine. It's been discussed here before for sure.

https://mbworld.org/forums/w212-amg/...itching-s.html

https://mbworld.org/forums/w212-amg/...servation.html

Last edited by PeterUbers; Jun 14, 2025 at 10:10 PM.
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Old Jun 15, 2025 | 12:07 AM
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Originally Posted by PeterUbers
It happens to some of the e63's but not all of them, doesn't happen on mine. It's been discussed here before for sure.

https://mbworld.org/forums/w212-amg/...itching-s.html

https://mbworld.org/forums/w212-amg/...servation.html
Interesting, why the variation?
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Old Jun 15, 2025 | 12:44 AM
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Generally the idle RPM is raised in the sportiest modes if the engine is turbo charged. Gets the idle RPM closer to where the turbos start producing boost, so less lag off the line. Not common with naturally aspirated engines. FWIW, the PFL W212 had the naturally aspirated 6.2L whereas the FL W212 got the 5.5L twin-turbo, so I would expect that this happens in the FL. All the current AMGs do this as well, and it's not just AMGs. I know the turbo-charged Audi S and RS models do this, too. However, my NA 2013 Audi RS5 didn't do it.

Last edited by superswiss; Jun 15, 2025 at 12:54 AM.
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Old Jun 15, 2025 | 09:39 AM
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I’d bet there are subtle factory adjustments over the model years. Mine is a 2014, and the idle only bumps up in M mode. Reading the above threads, it looks like maybe Mercedes made model year changes where S and S+ began also bumping up the idle.

it would be nice if mine did that in S And S+… I’m about 2 years in on billet/poly engine mounts and I’m getting a harmonic vibration that resonates through the cabin and mirrors. Is not huge, but can be annoying… it seems to be getting stronger over time. Hopefully my mounts arent failing or something. Sometimes I put it in M mode just to stop it from doing that.
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Old Jun 15, 2025 | 11:08 AM
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Originally Posted by W205C43PFL
Interesting, why the variation?
it's hard to know if everyone's up-to-date on their factory ECU updates, at least at the time of these postings in the thread and it's hard to know beyond that why, it's a good question though
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Old Jun 15, 2025 | 12:41 PM
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cancel HARMONIC VIBRATIONS...

Originally Posted by QuadTurboPrius
I’d bet there are subtle factory adjustments over the model years. Mine is a 2014, and the idle only bumps up in M mode. Reading the above threads, it looks like maybe Mercedes made model year changes where S and S+ began also bumping up the idle.

it would be nice if mine did that in S And S+… I’m about 2 years in on billet/poly engine mounts and I’m getting a harmonic vibration that resonates through the cabin and mirrors. Is not huge, but can be annoying… it seems to be getting stronger over time. Hopefully my mounts arent failing or something. Sometimes I put it in M mode just to stop it from doing that.
it's not engine mounts that vibrate/shake...

uneven CONTRIBUTIONS causes harmonic vibrations beyond what balancer can smooth out.

You can go after the cause to get more power from better contributions.

Last edited by CaliBenzDriver; Jun 15, 2025 at 12:57 PM.
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Old Jun 15, 2025 | 01:10 PM
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Originally Posted by PeterUbers
It happens to some of the e63's but not all of them, doesn't happen on mine. It's been discussed here before for sure.

https://mbworld.org/forums/w212-amg/...itching-s.html

https://mbworld.org/forums/w212-amg/...servation.html

I see! Thank you. Not much concrete then unfortunately, and doesnt seem to be too consistent either, but something id definitely keep an eye out for on a test drive! Thank you very much
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Old Jun 15, 2025 | 04:48 PM
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W212 E63 S AMG
Originally Posted by CaliBenzDriver
it's not engine mounts that vibrate/shake...

uneven CONTRIBUTIONS causes harmonic vibrations beyond what balancer can smooth out.

You can go after the cause to get more power from better contributions.
What contributions do you suggest checking? The idle is consistent and on target and stable compared to older logs - and it's putting down 3.2 to 3.4 0-60 times consistently. It seems like some system going wrong would cause one or both of these to show signs of trouble.

I have done the solenoid disable and moved to 5w50, but have not done the ALT-LIN disable yet
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Old Jun 15, 2025 | 05:08 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by QuadTurboPrius
What contributions do you suggest checking?
The idle is consistent and on target and stable compared to older logs - and it's putting down 3.2 to 3.4 0-60 times consistently. It seems like some system going wrong would cause one or both of these to show signs of trouble.

I have done the solenoid disable and moved to 5w50
but have not done the ALT-LIN disable yet.
Performance is really good overall...
but something causing engine vibrations.
We can cancel that out likely for free.

How long ago was your 5w50 upgrade ??

These damn GDI computers are touchy sensitive for better or worst. We just need to help engine please ECU... to give us more fuel/power.


Do the "whole" ALT-LIN with reboot + battery float charge up.

How would you rate your ignition:
How old plugs? boots? coils? gaps?

How old are Lambdas ?
LTFT-1 / -2 at warm idle ??

Let's cover the basics before considering compressions check while dealing with plugs.


> BALANCING ACT...:
GDI is really affected by unstable timings. An effective seal keep crank rotation predictable.

When every piston...
is at the right position
at the right time
with the right mixture
then contribution is perfect.
All penalties translate in leaner mixture.


Last edited by CaliBenzDriver; Jun 15, 2025 at 05:19 PM.
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Old Jun 15, 2025 | 06:12 PM
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W212 E63 S AMG
Originally Posted by CaliBenzDriver
How long ago was your 5w50 upgrade ??
Several months ago - probably at least 8k miles

Originally Posted by CaliBenzDriver
Do the "whole" ALT-LIN with reboot + battery float charge up.
I plan on it... but there's just no access to that plug without dropping the steering rack, which I am not interested in doing. I tried installing a switch on the ECU pin that ALT-LIN leads to, but that line also addresses the oil-temp sensor, so it's not a good solution. I'll be replacing all the idler pulleys soon, along with the A2D intake, so maybe I'll be able to get it unplugged when I have things more open

Originally Posted by CaliBenzDriver
How would you rate your ignition:
How old plugs? boots? coils? gaps?
The plugs have about 17k miles on them. I think the boots and coils are original.

Originally Posted by CaliBenzDriver
How old are Lambdas ?
LTFT-1 / -2 at warm idle ??
Im not sure what you mean here... isn't the lambda value an AFR derivative data value? What do you mean "how old" are they?

Based on my most recent log (2 months old) They bank 1 and 2 AFRs are right where they should be and track the commanded values. I'll gather a new log as soon as I can
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Old Jun 15, 2025 | 08:08 PM
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Originally Posted by QuadTurboPrius
I’d bet there are subtle factory adjustments over the model years. Mine is a 2014, and the idle only bumps up in M mode. Reading the above threads, it looks like maybe Mercedes made model year changes where S and S+ began also bumping up the idle.

it would be nice if mine did that in S And S+… I’m about 2 years in on billet/poly engine mounts and I’m getting a harmonic vibration that resonates through the cabin and mirrors. Is not huge, but can be annoying… it seems to be getting stronger over time. Hopefully my mounts arent failing or something. Sometimes I put it in M mode just to stop it from doing that.
Perhaps the sound is also better at higher rpm idle maybe, you just feel more "Ready to go" as well.
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Old Jun 15, 2025 | 08:12 PM
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Originally Posted by PeterUbers
it's hard to know if everyone's up-to-date on their factory ECU updates, at least at the time of these postings in the thread and it's hard to know beyond that why, it's a good question though
Good point, it does seem like even TCU updates could affect this (as in rpm and engine behaviour) behaviour for example, some 2017-2018 (so other models) model year vehicles that got an update in 2019 that forces a "cold start" despite temperatures already warm.
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Old Jun 16, 2025 | 03:12 AM
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Originally Posted by QuadTurboPrius
Several months ago - probably at least 8k miles



I plan on it... but there's just no access to that plug without dropping the steering rack, which I am not interested in doing. I tried installing a switch on the ECU pin that ALT-LIN leads to, but that line also addresses the oil-temp sensor, so it's not a good solution. I'll be replacing all the idler pulleys soon, along with the A2D intake, so maybe I'll be able to get it unplugged when I have things more open



The plugs have about 17k miles on them. I think the boots and coils are original.


Im not sure what you mean here... isn't the lambda value an AFR derivative data value?
What do you mean "how old" are they?

Based on my most recent log (2 months old) They bank 1 and 2 AFRs are right where they should be and track the commanded values. I'll gather a new log as soon as I can
RELIABLE IGNITION...
What the total current mileage... 80kMi?
17kMi plugs are likely good....
You can keep the coils but do replace the cheap boots. They have a built in resistor carbon stack...

check all gaps are either exat or under gaped to ensure reliable spark.
Wider gaps make longer sparks BUT with UNRELIABLE TIMINGS = no-no!!
The ECU prefers shorter reliable sparks (decrease by 1/10th).


STABLE VOLTAGE...
You can experiment with the BATT-LIN sensor disconnected. It has super easy access unlike ALT-LIN. Find a way to log the voltage, see that it remains stable.
I have not tested this BATT-LIN mod.


LAMBDA SENSOR...
Old dirty sensors have slower response that leans out AF mixture.

Replace as you see fit on or before 90kMi based on how much oil the engine uses through PCV or pistons rings... either way it deposits carbon on the dirty Lambdas.
Its not a killer priority, its due when milage is up without waiting for the heater circuit to go open.
Lambda help ECU compute the AFR.

From your logs and generally good performance we can guess you don't have any fuel pressure issues.

From there youll want to measure/comp your cyl compressions.

Last edited by CaliBenzDriver; Jun 16, 2025 at 03:23 AM.
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Old Jun 16, 2025 | 10:07 PM
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Originally Posted by CaliBenzDriver
RELIABLE IGNITION...
What the total current mileage... 80kMi?
17kMi plugs are likely good....
You can keep the coils but do replace the cheap boots. They have a built in resistor carbon stack...

check all gaps are either exat or under gaped to ensure reliable spark.
Wider gaps make longer sparks BUT with UNRELIABLE TIMINGS = no-no!!
The ECU prefers shorter reliable sparks (decrease by 1/10th).


STABLE VOLTAGE...
You can experiment with the BATT-LIN sensor disconnected. It has super easy access unlike ALT-LIN. Find a way to log the voltage, see that it remains stable.
I have not tested this BATT-LIN mod.


LAMBDA SENSOR...
Old dirty sensors have slower response that leans out AF mixture.

Replace as you see fit on or before 90kMi based on how much oil the engine uses through PCV or pistons rings... either way it deposits carbon on the dirty Lambdas.
Its not a killer priority, its due when milage is up without waiting for the heater circuit to go open.
Lambda help ECU compute the AFR.

From your logs and generally good performance we can guess you don't have any fuel pressure issues.

From there youll want to measure/comp your cyl compressions.
My car has 75k miles

I did some logging yesterday and today and, oddly, I seem to have lost all my bank 2 sensor data... I'm using an OBD2 logger and am not sure what's going wrong. The car is behaving as normal otherwise, so I think it's just something in the OBD2 system. I noticed it not logging, reset the device (via completely unplugging it for several hours) and tried again today... no bank 2 data. It's this one
https://bankspower.com/products/bank...tal-datalogger

I may try disconnecting both batteries and to see if some module just isn't communicating for some reason. But, given how well the car is behaving, it's hard to imagine that I've actually lost all my bank 2 sensor data as far as the ECU is concerned. its very odd. I'm going to hook up a scan tool tomorrow and see if I can read bank 2 data at all - see if maybe the logger I am using is faulty

Oh, it it occurs to me that my vibration at certain idle speeds while in gear may just be the result of the new exhaust I put on. The sound itself isn't doing it, but maybe the difference in how the exhaust interacts with the manifold pressure might have something to do with it.

Last edited by QuadTurboPrius; Jun 16, 2025 at 10:18 PM.
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Old Jun 17, 2025 | 12:25 AM
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Banks logging cuts both ways...

Originally Posted by QuadTurboPrius
My car has 75k miles

I did some logging yesterday and today and, oddly, I seem to have lost all my bank 2 sensor data... I'm using an OBD2 logger and am not sure what's going wrong. The car is behaving as normal otherwise, so I think it's just something in the OBD2 system. I noticed it not logging, reset the device (via completely unplugging it for several hours) and tried again today... no bank 2 data. It's this one
https://bankspower.com/products/bank...tal-datalogger

I may try disconnecting both batteries and to see if some module just isn't communicating for some reason. But, given how well the car is behaving, it's hard to imagine that I've actually lost all my bank 2 sensor data as far as the ECU is concerned. its very odd. I'm going to hook up a scan tool tomorrow and see if I can read bank 2 data at all - see if maybe the logger I am using is faulty

Oh, it it occurs to me that my vibration at certain idle speeds while in gear may just be the result of the new exhaust I put on. The sound itself isn't doing it, but maybe the difference in how the exhaust interacts with the manifold pressure might have something to do with it.
I am not big on loading the CAN network 24x7 with additional device... you have an example why that is.

I bet it's only the CGW that needs a reboot (+ float) - Chassis works best afterwards.

A while ago I was searching for a quick shortcut and failed to locate a fuse I could use to power cycle CGW... so I Simply Reboot the whole enchilada.

ALT-LIN stable voltage allows to reboot chassis unfrequently. Stock benefit more frequent reboot to benefit its stability.

ECU exact timings are affected by CAN activities as witnessed by a fresh reboot helping how well engine runs.
Misc modules keep dishing out tons of non-stop queries for Rpm (ECU) and speed (ESP) and steering angle (LED HL) and torque (TCU)... the CGW must translate everything near real time.

The Bosch ECU and the Bosch CGW are assaulted by every module with seemingly limited way to guard core performance.
Solderless help generate higher traffic level.
The key is to decrease latencies as much as practical ie. less unnecessary traffic.

I have found a way Mercedes uses to set members of the same CAN on different threshold levels. Disabling that should be rewarding in stability and speed. I think this unnecessary isolating detunes CAN performance. I need to survey diagrams and setup a test plan.

I realize that every time we cancel artificial instabilities, we rope in more performance:
  • Limited oil pressure
  • chassis voltage swings
  • engine heat extremes
  • now CAN bandwidth

MS using Banks loggers captured actionable field data. Now you know not to log 24x7 to preseve MB performance or reboot more frequently.


Last edited by CaliBenzDriver; Jun 17, 2025 at 12:29 AM.
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Old Jun 17, 2025 | 07:48 AM
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Thanks!

can you list the reboot procedure?
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Old Jun 17, 2025 | 01:22 PM
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TESTING BATT-LIN VOLTAGE

Originally Posted by QuadTurboPrius
Thanks!

can you list the reboot procedure?
Let me locate that thread... I recall linking REBOOT procedure as a part of ALT-LIN thread.

"Reboot procedure" may be used to sanitize chassis benefit BATT-LIN as well.

Test BATT-LIN to see how it interacts with ECU voltage control of ALT.
The flip side is BATT-LIN may increase CGW traffic between ECU and R-SAM which ALT-LIN does not.

Expect IC-Display of "Volt/Batt" data to read blanks... Use a $10 cig-lighter "usbPwr/voltage reader" to monitor chassis voltage while driving.

Low voltage while driving effectively "limp-modes" the stock setup: Do keep an eye on voltage until you trust BATT-LIN !!

Last edited by CaliBenzDriver; Jun 17, 2025 at 02:17 PM. Reason: reboot thread
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Old Jun 17, 2025 | 09:00 PM
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For reference my 2016 definitely changed idles in the different modes. Sport+ was like a happy scrappy puppy chasing its tail ready to go
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Old Jun 19, 2025 | 09:15 AM
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Originally Posted by CaliBenzDriver
Let me locate that thread... I recall linking REBOOT procedure as a part of ALT-LIN thread.

"Reboot procedure" may be used to sanitize chassis benefit BATT-LIN as well.

Test BATT-LIN to see how it interacts with ECU voltage control of ALT.
The flip side is BATT-LIN may increase CGW traffic between ECU and R-SAM which ALT-LIN does not.

Expect IC-Display of "Volt/Batt" data to read blanks... Use a $10 cig-lighter "usbPwr/voltage reader" to monitor chassis voltage while driving.

Low voltage while driving effectively "limp-modes" the stock setup: Do keep an eye on voltage until you trust BATT-LIN !!
I fixed my logging issue - the Banks logger needed a profile reset, which causes a reboot of the logger.

After this, I tested the BATT-LIN disconnect... this is not a viable alternative to ALT-LIN disconnect on my car:
- The voltage was centered around 14.1v instead of the typical 14.4v to14.8v, as with the ALT-LIN, but was NOT fully stable. I still observed swings from 13.5v to 14.4v.
- Eco-mode was default-disabled, but the car also had random other behaviors -- After being parked overnight and beginning my commute this morning, it would not use 7th gear and would not respond to my paddle requests to shift into 7th gear. Who knows what else it was doing that I didn't detect. I pulled over and reconnected it for the remainder of my commute.

I'll try to get to the ALT-LIN this weekend if I can sneak away for long enough to do some maintenance (replace idler pulleys and install A2D intake)
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Old Jun 19, 2025 | 02:55 PM
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Originally Posted by QuadTurboPrius
I fixed my logging issue - the Banks logger needed a profile reset, which causes a reboot of the logger.

After this, I tested the BATT-LIN disconnect... this is not a viable alternative to ALT-LIN disconnect on my car:
- The voltage was centered around 14.1v instead of the typical 14.4v to14.8v, as with the ALT-LIN, but was NOT fully stable. I still observed swings from 13.5v to 14.4v.
- Eco-mode was default-disabled, but the car also had random other behaviors -- After being parked overnight and beginning my commute this morning, it would not use 7th gear and would not respond to my paddle requests to shift into 7th gear. Who knows what else it was doing that I didn't detect. I pulled over and reconnected it for the remainder of my commute.

I'll try to get to the ALT-LIN this weekend if I can sneak away for long enough to do some maintenance (replace idler pulleys and install A2D intake)
BATT-LIN still keeps ECU in control of mis-managing ALT output voltage... too bad voltage still unstable.

The "lazy paddle shifter" is an interesting poor networking side effect.

You can try to manually shift but the signal from SCM does not reach TCU through CGW!

This can also be a local issue with the steering wheel LIN bus to the main steering SCM . The whole steering wheel + column is "pressed pins"...

See how this fares with basic "reboot + float" - Both Main/Aux batteries disconnected.

W212 chassis is proven VOLTAGE SENSITIVE!!
Knowing this we turn around that feature in our favor with "ALT-LIN steps" for stable electricals.
Enjoy robust performance.

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Old Jun 20, 2025 | 10:18 PM
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Originally Posted by QuadTurboPrius
I fixed my logging issue - the Banks logger needed a profile reset, which causes a reboot of the logger.

After this, I tested the BATT-LIN disconnect... this is not a viable alternative to ALT-LIN disconnect on my car:
- The voltage was centered around 14.1v instead of the typical 14.4v to14.8v, as with the ALT-LIN, but was NOT fully stable. I still observed swings from 13.5v to 14.4v.
- Eco-mode was default-disabled, but the car also had random other behaviors -- After being parked overnight and beginning my commute this morning, it would not use 7th gear and would not respond to my paddle requests to shift into 7th gear. Who knows what else it was doing that I didn't detect. I pulled over and reconnected it for the remainder of my commute.

I'll try to get to the ALT-LIN this weekend if I can sneak away for long enough to do some maintenance (replace idler pulleys and install A2D intake)
Just do headlight ON all the time to achieve the same stable voltage or at least very close to it.
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Old Jun 20, 2025 | 10:19 PM
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Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


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5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


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Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


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10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


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