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2008 S550 4Matic SUPER HIGH OIL CONSUMPTION(also few questions about motor oils)

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Old Jan 14, 2015 | 11:57 PM
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2008 Mercedes Benz S550 4Matic
2008 S550 4Matic SUPER HIGH OIL CONSUMPTION(also few questions about motor oils)

Hey guys!
I recently purchased a 2008 s550 4matic with 99400Miles on it.
Drive the car about a week and the mpg is 8.9.Is this normal?
I checked the average mpg since last odometer reset and it says 31.

Also,the car dealer put in 10w-30 motor oil.I'm not sure if its good to my car.
which motor oil you guys use?After days of research online I think 0w-40 is great.

Teach me something if you can.This the the first car I own and I want to make sure everything is the best for the car.

Last edited by Wings of Divine; Jan 15, 2015 at 07:43 AM.
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Old Jan 15, 2015 | 01:05 AM
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Contact your dealer immediately and have them show you documentation from Mercedes that approves of the use of 10W30 motor oil for your vehicle. I doubt they will be able to do this.

There is no 10W30 oil shown on the Mercedes list of approved motor oil. If I am correct, they may have damaged your engine. Have your oil and oil filter replaced immediately by a different Mercedes dealer and INSIST that the dealer who changed your oil pay for it. I would NOT trust a dealer who used the wrong type of oil. The oil for your vehicle MUST be compliant with Mercedes specification 229.5

The following is from your vehicle owner's manual:
Using engine oils and oil filters of specification other than those expressly required for the Maintenance System, or changing of oil and oil filter at change intervals longer than those called for by the Maintenance System will result in engine or emission control system damage not covered by the Mercedes-Benz Limited Warranty

Something is definitely wrong with your MPG values. If is impossible for your vehicle to have 31 MPG since last reset. Normal MPG for your vehicle should be 20 to 27 for steady freeway travel. It could drop down to 15 MPG on city streets with a lot of stop and go traffic. The only way to get much lower than this would be with a lot of time stopped in traffic. If you are getting 8.9 MPG, it is very likely that your engine is severely damaged; which could require several thousand dollars to repair. Did you get any kind of warranty when you purchased your vehicle?

Last edited by steveb9771; Jan 15, 2015 at 01:44 AM.
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Old Jan 15, 2015 | 07:33 AM
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Originally Posted by steveb9771
Contact your dealer immediately and have them show you documentation from Mercedes that approves of the use of 10W30 motor oil for your vehicle. I doubt they will be able to do this.

There is no 10W30 oil shown on the Mercedes list of approved motor oil. If I am correct, they may have damaged your engine. Have your oil and oil filter replaced immediately by a different Mercedes dealer and INSIST that the dealer who changed your oil pay for it. I would NOT trust a dealer who used the wrong type of oil. The oil for your vehicle MUST be compliant with Mercedes specification 229.5

The following is from your vehicle owner's manual:
Using engine oils and oil filters of specification other than those expressly required for the Maintenance System, or changing of oil and oil filter at change intervals longer than those called for by the Maintenance System will result in engine or emission control system damage not covered by the Mercedes-Benz Limited Warranty

Something is definitely wrong with your MPG values. If is impossible for your vehicle to have 31 MPG since last reset. Normal MPG for your vehicle should be 20 to 27 for steady freeway travel. It could drop down to 15 MPG on city streets with a lot of stop and go traffic. The only way to get much lower than this would be with a lot of time stopped in traffic. If you are getting 8.9 MPG, it is very likely that your engine is severely damaged; which could require several thousand dollars to repair. Did you get any kind of warranty when you purchased your vehicle?

wow thanks for the early respond!
well I live in NYC and there's tons of stop on the road.but now I doubt will it go down to 8.9mpg
Yes this vehicle does comes with 1 month bumper to bumper warranty.
I will call the dealer later.These people

Last edited by Wings of Divine; Jan 15, 2015 at 07:36 AM.
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Old Jan 15, 2015 | 08:21 AM
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Lol. It is winter. Nothing got damaged at stop and go traffic in new york with the heaters running and keeping the engine cooler. relax.

But... It is the wrong oil. You need to run 0w40 full synthetic.

Your mpg is very low, but in Nyc might be ok.

You mention oil consumption- what is yours?
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Old Jan 15, 2015 | 08:42 AM
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Originally Posted by alx
Lol. It is winter. Nothing got damaged at stop and go traffic in new york with the heaters running and keeping the engine cooler. relax.

But... It is the wrong oil. You need to run 0w40 full synthetic.

Your mpg is very low, but in Nyc might be ok.

You mention oil consumption- what is yours?
what i mean by high oil consumption is extremely low mpg
Seems like i used the wrong word. = =
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Old Jan 15, 2015 | 09:21 AM
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i see.

the mpg you are quoting is typical for the v12 tt cars in city traffic. however, it might be a bit low for your car though.

but it depends on your driving style.

get couple bottles of chevron techron additive and do some italian tuning then report back with your highway and city mpg.
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Old Jan 15, 2015 | 08:30 PM
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Originally Posted by alx
i see.

the mpg you are quoting is typical for the v12 tt cars in city traffic. however, it might be a bit low for your car though.

but it depends on your driving style.

get couple bottles of chevron techron additive and do some italian tuning then report back with your highway and city mpg.
I did put a STP additive for clean injectors.
Italian tuning? sounds expensive= =

Last edited by Wings of Divine; Jan 15, 2015 at 08:36 PM.
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Old Jan 15, 2015 | 08:34 PM
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Originally Posted by steveb9771
Contact your dealer immediately and have them show you documentation from Mercedes that approves of the use of 10W30 motor oil for your vehicle. I doubt they will be able to do this.

There is no 10W30 oil shown on the Mercedes list of approved motor oil. If I am correct, they may have damaged your engine. Have your oil and oil filter replaced immediately by a different Mercedes dealer and INSIST that the dealer who changed your oil pay for it. I would NOT trust a dealer who used the wrong type of oil. The oil for your vehicle MUST be compliant with Mercedes specification 229.5

The following is from your vehicle owner's manual:
[I]Using engine oils and oil filters of specification other than those expressly required for the Maintenance System, or changing of oil and oil filter at change intervals longer than those called for by the Maintenance System will result in engine or emission control system damage not covered by the Mercedes-Benz Limited Warranty
I called them during noon and they agreed to change filters(oil,air and cabin)this Sunday.I also told them that "wrong motor oil will result in engine or emission control system damage not covered by the Mercedes-Benz Limited Warranty". I will talk more on that when I meet them.


Thanks Steve! lots of help
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Old Jan 15, 2015 | 11:29 PM
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Originally Posted by Wings of Divine
I did put a STP additive for clean injectors.
Italian tuning? sounds expensive= =
No. Chevron techron - happens to be also the only approved gasoline additive by Mercedes Benz.

Italian tuning is fairly cheap lol
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Old Jan 15, 2015 | 11:44 PM
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If the engine is running fine Maybe your brakes could be seized up in the caliper and dragging on the rotor? Any weird dragging or brake noise?
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Old Jan 15, 2015 | 11:47 PM
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Originally Posted by Nickthegreek
If the engine is running fine Maybe your brakes could be seized up in the caliper and dragging on the rotor? Any weird dragging or brake noise?
Lol. Any drag enought to lower mpg will result in smoke
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Old Jan 15, 2015 | 11:59 PM
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Originally Posted by alx
Lol. Any drag enought to lower mpg will result in smoke
Not necessarily
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Old Jan 15, 2015 | 11:59 PM
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Originally Posted by alx
No. Chevron techron - happens to be also the only approved gasoline additive by Mercedes Benz.

Italian tuning is fairly cheap lol
Thanks for the info---its REALLY helpful

gimme a price range on italian tuning plsssssss
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Old Jan 16, 2015 | 12:04 AM
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Originally Posted by Nickthegreek
If the engine is running fine Maybe your brakes could be seized up in the caliper and dragging on the rotor? Any weird dragging or brake noise?
I heard none brake noise so far.
I also asked my dealer to change my brake fluid this Sunday with MY SUPERVISION(Aha no more wrong oil/fluid xD).
but it takes longer than a 2014 toyota corolla(its my coach's car) to have a full stop.Is that because of s550 have a electronic brake assist or its simply need to change the brake pads?
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Old Jan 16, 2015 | 12:10 AM
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Originally Posted by Wings of Divine
I heard none brake noise so far.
I also asked my dealer to change my brake fluid this Sunday with MY SUPERVISION(Aha no more wrong oil/fluid xD).
but it takes longer than a 2014 toyota corolla(its my coach's car) to have a full stop.Is that because of s550 have a electronic brake assist or its simply need to change the brake pads?
If the car pulls or when it's off the ground and you try to spin the wheels they do not want to easily spin something may be binding. Worth a shot to have the dealer check
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Old Jan 16, 2015 | 12:29 AM
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Originally Posted by Nickthegreek
If the car pulls or when it's off the ground and you try to spin the wheels they do not want to easily spin something may be binding. Worth a shot to have the dealer check
Hmm...that never happened.
Thanks for the info!Learnt something new~
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Old Jan 16, 2015 | 09:12 AM
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Originally Posted by Nickthegreek
Not necessarily
on a 5000 pound car with forward inertia of a freight train? that poor caliper will be red hot and smoking. been there done that. still didnt feel a thing in the steering and my only clue was other drivers pointing at my wheel with a scared expression on their faces lol

your calipers are not dragging. you just need a competent shop to allign your car. the shop you are using has a miscalibrated alignment rack- there are many many of those out there.
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Old Jan 16, 2015 | 11:41 AM
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Originally Posted by Wings of Divine
I called them during noon and they agreed to change filters(oil,air and cabin)this Sunday.I also told them that "wrong motor oil will result in engine or emission control system damage not covered by the Mercedes-Benz Limited Warranty". I will talk more on that when I meet them.


Thanks Steve! lots of help
I would not trust them to perform any work on your vehicle. All competent Mercedes mechanics know the proper oil to use. They can do further vehicle damage by not properly installing the oil filter. It is obvious that they have no experience working on Mercedes vehicles. I would insist they pay for the service at an established Mercedes repair facility (could be an indy that specializes in Mercedes).

Did you have your vehicle inspected by a qualified Mercedes mechanic prior to purchase? If not, I would have an inspection performed prior to expiration of your warranty. I might even demand they repurchase the vehicle if the inspection reveals any other issues.
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Old Jan 16, 2015 | 01:45 PM
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Originally Posted by steveb9771
I would not trust them to perform any work on your vehicle. All competent Mercedes mechanics know the proper oil to use. They can do further vehicle damage by not properly installing the oil filter. It is obvious that they have no experience working on Mercedes vehicles. I would insist they pay for the service at an established Mercedes repair facility (could be an indy that specializes in Mercedes).

Did you have your vehicle inspected by a qualified Mercedes mechanic prior to purchase? If not, I would have an inspection performed prior to expiration of your warranty. I might even demand they repurchase the vehicle if the inspection reveals any other issues.
I will have your words in mind and do that.
Thank you again friend!
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