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

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.
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.
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.
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?
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?
Seems like i used the wrong word. = =
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.
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.Italian tuning? sounds expensive= =
Last edited by Wings of Divine; Jan 15, 2015 at 08:36 PM.
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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
Thanks Steve! lots of help
The Best of Mercedes & AMG


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?


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?
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.
Thanks Steve! lots of help

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.
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.
Thank you again friend!





