e-class 350

Hi all, I hope anyone can help me with this question: I was mistakely fuel 87 instead of 91 to the E-class 350 Mecedes. I really don't know what to do. Does it cause damage to the car's part???? please help. Thanks much.

cyclerider

No worries. Just be sure to use Premium fuel next time.

Barry45RPM

Also, to help ease your mind, when you need a half tank of gas, fill it with the highest octane you can find... it will average the octane out. ...But a single tankfull of "Regular" won't hurt a thing. Just drive reasonably & avoid full throttle accelleration.

sklasse

I did that and it fked up the timings for startup.

do this immediately don't drive the car, call the dealer and have it flushed out...its doesn't cost more than 100 bucks, but you can ruin your car..

just my 2 cents peace.

MagicO309D

Don't worry, no damage will result. W211 has knock sensors and the engine will just retime itself if needed. MB federalizes it's engines with premium fuel to acheive emissions certification. If it will make you feel better, tank up with premium after you burn through a third of the tank.

I'm a cheapskate and never use premium fuel myself. Our CLK 350 has the same engine and I've never heard any trace of knocking even lugging up the steepest grades. With the top down, I'm shure it would be easy to hear too.

DWP

My '73 Datsun, with nothing electronic, demands 91 octane and would knock/ping badly on 87. It has no way of automatically adjusting its timing for lower octane, not to mention that carbon buildup over the years has actually increased its compression ratio. That was then, though. A W211, like most modern cars, will automatically adjust timing to the octane of the fuel. With 87 you probably won't hear pinging, much less experience any damage. The downside of using octanes lower than 91? Reduced performance, and increased fuel consumption, probably offsetting the lower price of 87 gas. You do not, repeat, do not, have to flush out your tank or any such thing. Now, if you had put in diesel by mistake ... but you didn't.

HELL ONA HARLEY

L.O.L.......

Barry45RPM

Absolutely preposterous. Doing that will ruin a perfectly good day & ruin a perfect $100.00 bill. Any dealer that told you that, I wouldn't go to for ANY service that I would have to pay for...

benzvibes

My Father-in-law is considering an E350 but he refuses to buy anything other then 87.

So I started to search and found many technical people say it's ok to use low / mid grade.

Magic have you been using 87 or 89?

Anyone else run 87 regularly?

I thought this was interesting:
http://www.usatoday.com/money/autos/...emiumgas_x.htm

Frugal1

My salesman says he uses mid-grade all of the time and he says all of the salesmen and repair folks say the same thing.

The car will adjust the timing on the fly like others have said. You might notice a minor decrease in performance if you are very observant.

Octane ratings are reached in different ways. There isn't more energy per se in higher octane fuels of today . . there is and there isn't . . it's complicated. Think of premium as a slower burning fuel which also resists pre-detonation.

You will not hurt anything but a little performance. It's the same way in reverse . . .if you have a car that wants regular, premium will not hurt (or help).

vraa

https://mbworld.org/forums/showthrea...r+premium+fuel
Been discussed before

akbro93704

ya,one tank won't hurt, but obviously this has been discussed before. I have noticed, however, that these new design DOHC V6 engines ping like crazy using regular, when no pinging was heard in the older sohc designs. We always use premium in our cars, but I've heard the pinging in the past three loaner '06 C230 and C280's we've had, it's almost embarassing at low rpm/high load situations. so just make sure to use premium from now on.

TPAbnz

Now, if you put that in your CDI . . .