what's some worthwhile PM on a 2008 S550 with 130K miles?
Thread Starter
Member
Joined: Apr 2022
Posts: 147
Likes: 47
From: Tewksbury, MA
2008 S550
what's some worthwhile PM on a 2008 S550 with 130K miles?
She's running great right now. PM I've done was spark plugs at 105K, trans service and pulleys/belts at 120k, cabin/air filters at 129K. Front driveshaft at 122K after it failed. So far the S550 has been very reliable, necesary repairs were front wheel bearings around 124K and some front end components along the way. 3 and a half years of driving and 30k miles.
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Joined: Mar 2018
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2006 W221 S500L M273
The air flaps on the intake manifold can fail, check them too.
Re-check the tolerance of the replaced wheel bearing after 1000 miles (ask me how i know...)
Clear the water drains from the sunroof all the way down to the wheel wells
Re-check the tolerance of the replaced wheel bearing after 1000 miles (ask me how i know...)
Clear the water drains from the sunroof all the way down to the wheel wells
Thread Starter
Member
Joined: Apr 2022
Posts: 147
Likes: 47
From: Tewksbury, MA
2008 S550
Jaap where exactly are those airflaps you're talking about
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Joined: Mar 2018
Posts: 493
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2006 W221 S500L M273
Read this thresd: https://mbworld.org/forums/e-class-w...fters-cam.html
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Joined: Aug 2014
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S500
tumble flaps - tractors get swirl flaps - the secret add-on from 19 years ago to destroy all engines as the mileage creeps up
the idea is to increase turbulence on the airflow to better mix the fuel as it goes in the combustion chamber - its only effective at tick over up to 1500 rpm - if you remove or jam in the open position you almost can't tell you did it - but they do love to break off and the engine ingests them - if unlucky the valves and pistons will not like life but the best bit they always destroy any turbo they get to find later on
when BMW first fitted tumble flaps they were made of Brass and definitely destroy the engine from 65k miles (as if designed to fail directly after the warranty ended) it was such a time clock they later went to plastic like merc use and it only destroys half the engines and every turbo they meet
its not just the linkage on the outside - its the tumble flaps inside the manifold that snap off and the engine eats them - you have to buy and entire manifold - check aliexpress $400
the idea is to increase turbulence on the airflow to better mix the fuel as it goes in the combustion chamber - its only effective at tick over up to 1500 rpm - if you remove or jam in the open position you almost can't tell you did it - but they do love to break off and the engine ingests them - if unlucky the valves and pistons will not like life but the best bit they always destroy any turbo they get to find later on
when BMW first fitted tumble flaps they were made of Brass and definitely destroy the engine from 65k miles (as if designed to fail directly after the warranty ended) it was such a time clock they later went to plastic like merc use and it only destroys half the engines and every turbo they meet
its not just the linkage on the outside - its the tumble flaps inside the manifold that snap off and the engine eats them - you have to buy and entire manifold - check aliexpress $400
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Joined: Jul 2014
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From: Tucson, AZ
'20 X5 M50i; '17 Ram 3500; Golf Cart; Bikes; Scooters
Engine mounts and trans mount are high on the list for replacement if never done before. Check the drive shaft guibos for wear too.
You should check the oil separator at the rear of the right valve cover for oil passage. Pop the hose off and see if there is excess oil is inside.
If the separator lets oil past, it will gum up the tumble valves mentioned above, and seize/break/fail them.
You should check the oil separator at the rear of the right valve cover for oil passage. Pop the hose off and see if there is excess oil is inside.
If the separator lets oil past, it will gum up the tumble valves mentioned above, and seize/break/fail them.
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2006 S350L
>> Re-check the tolerance of the replaced wheel bearing after 1000 miles (ask me how i know...)
@Jaap
I'm facing an ABS issue
I think it's the magnetic disk
I'm thinking of replacing the affected wheel's bearing (front right)
Why do you say to re-check the tolerance?
I'll be using a dealer-original bearing
Something happened to you?
@Jaap
I'm facing an ABS issue
I think it's the magnetic disk
I'm thinking of replacing the affected wheel's bearing (front right)
Why do you say to re-check the tolerance?
I'll be using a dealer-original bearing
Something happened to you?
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From: USA
Re-checking tolerance ensures the bearing seat settled properly sometimes things shift after initial install. I’ve seen ABS issues pop up later due to minor movement or debris. OEM bearings help, but still worth verifying. Had a similar problem on mine; re-torquing fixed it.
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2007 Japan-spec S550 4Matic (W221)
Hi all, new member but long-ish time lurker.
I thought I'd add my question in here since it's so similar to the OP rather than start a new thread.
I've engaged the "help" of ChatGPT in putting together this maintenance schedule for my 2007 S550 4Matic. I'm not extremely mechanically-inclined and this is my first Mercedes.
Do any of you more experienced folks see anything missing or wrong on this schedule?
I thought I'd add my question in here since it's so similar to the OP rather than start a new thread.
I've engaged the "help" of ChatGPT in putting together this maintenance schedule for my 2007 S550 4Matic. I'm not extremely mechanically-inclined and this is my first Mercedes.
Do any of you more experienced folks see anything missing or wrong on this schedule?
✅ Immediate (As of today - July 2025 | 95,000 KM)
Transmission fluid & filter change
Spark plugs replacement (M273 V8)
PCV system inspection & cleaning
Engine & transmission mounts inspection (likely replace)
Replace wheel speed sensor (as diagnosed)
Replace acceleration sensor (as diagnosed)
Inspect AirMATIC for leaks (listen for hissing at rest)
Full STAR/Xentry diagnostic scan
Brake fluid flush
Oil and filter change
🔄 October 2025 | 100,000 KM
Replace cabin air filters
Replace engine air filters
Tire rotation & wheel balancing
Inspect rear main seal & oil filter housing for leaks
Clean sunroof drains
Undercarriage wash & rust inspection
Oil and filter change
🔧 January 2026 | 105,000 KM
Oil and filter change
🔧 April 2026 | 105,000 KM
Service D
Oil and filter change
Brake system inspection and fluid replacement
Transmission fluid check
Full inspection of suspension, steering, driveline
STAR diagnostic system scan
Air filter and cabin filter replacement
Tire condition check and rotation
Parking brake operation test
🔧 July 2026 | 110,000 KM
Oil and filter change
Service A (Oil/filter, fluids, brake check)
Battery health check
Inspect front/rear differential fluid (4MATIC)
Power steering fluid flush
🧰 January 2027 | 115,000 KM
Oil and filter change
🧰 July 2027 | 120,000 KM
Oil and filter change
Service B (includes Service A + brake flush + cabin filter)
Retorque suspension bolts
Replace serpentine belt
Inspect exhaust flex joints
Check steering linkage
🧰 January 2028 | 125,000 KM
Oil and filter change
⚙️ July 2028 | 130,000 KM
Oil and filter change
Transmission adaptation reset
Replace ignition coils (preventative)
Cooling system flush
Replace coolant hoses and radiator
🔁 Ongoing / Annual or Biannual Tasks
Inspect AirMATIC each year for sag or leaks
Update COMAND firmware if available
STAR diagnostic scan annually
Inspect timing chain guides if noise or rattle on startup
Battery inspection and charge cycle check (each fall)
Undercarriage wash each spring
Inspect ground straps for corrosion (biannually)
Transmission fluid & filter change
Spark plugs replacement (M273 V8)
PCV system inspection & cleaning
Engine & transmission mounts inspection (likely replace)
Replace wheel speed sensor (as diagnosed)
Replace acceleration sensor (as diagnosed)
Inspect AirMATIC for leaks (listen for hissing at rest)
Full STAR/Xentry diagnostic scan
Brake fluid flush
Oil and filter change
🔄 October 2025 | 100,000 KM
Replace cabin air filters
Replace engine air filters
Tire rotation & wheel balancing
Inspect rear main seal & oil filter housing for leaks
Clean sunroof drains
Undercarriage wash & rust inspection
Oil and filter change
🔧 January 2026 | 105,000 KM
Oil and filter change
🔧 April 2026 | 105,000 KM
Service D
Oil and filter change
Brake system inspection and fluid replacement
Transmission fluid check
Full inspection of suspension, steering, driveline
STAR diagnostic system scan
Air filter and cabin filter replacement
Tire condition check and rotation
Parking brake operation test
🔧 July 2026 | 110,000 KM
Oil and filter change
Service A (Oil/filter, fluids, brake check)
Battery health check
Inspect front/rear differential fluid (4MATIC)
Power steering fluid flush
🧰 January 2027 | 115,000 KM
Oil and filter change
🧰 July 2027 | 120,000 KM
Oil and filter change
Service B (includes Service A + brake flush + cabin filter)
Retorque suspension bolts
Replace serpentine belt
Inspect exhaust flex joints
Check steering linkage
🧰 January 2028 | 125,000 KM
Oil and filter change
⚙️ July 2028 | 130,000 KM
Oil and filter change
Transmission adaptation reset
Replace ignition coils (preventative)
Cooling system flush
Replace coolant hoses and radiator
🔁 Ongoing / Annual or Biannual Tasks
Inspect AirMATIC each year for sag or leaks
Update COMAND firmware if available
STAR diagnostic scan annually
Inspect timing chain guides if noise or rattle on startup
Battery inspection and charge cycle check (each fall)
Undercarriage wash each spring
Inspect ground straps for corrosion (biannually)
