Put wrong gass in c300
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Newbie
Joined: Oct 2019
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2016 C300 mercedes benz
Put wrong gass in c300
I accidentally put 89 instead of 91 in my c300, but when i noticed i put 89 it was at $24 and then i switched it to 91 which ended up costing me $34. What should I do now?
Senior Member
Joined: Jul 2019
Posts: 286
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From: Bay Area, CA
2016 C300W4 (W205), Luxury Pkg, Diamond Silver Met. and Silk Beige\Espresso Interior
No nothing at all will happen for one partial tankful. If there does happen to be any pre-detonation (knock) due to the 89 octane, the engine management systems (anti knock sensor, ECU, etc.) will adjust the engine timing to prevent any negative effects.
I saw a guy pumping 87 into his M-B here in Cali the other day. Highly unrecommended to do regularly as the long term effects (multiple tankfuls) can damage valves and pistons due to the firing/detonation that occurs too early in the combustion cycle. The engine can only compensate so much over the long term.
I saw a guy pumping 87 into his M-B here in Cali the other day. Highly unrecommended to do regularly as the long term effects (multiple tankfuls) can damage valves and pistons due to the firing/detonation that occurs too early in the combustion cycle. The engine can only compensate so much over the long term.
Member
Joined: Sep 2017
Posts: 174
Likes: 36
From: Central Oregon USA
2017 C300 Cab 4Matic
No. Your engine computer senses the combustion constantly and adjusts automatically for the octane. The only negative from occasional use of lower octane is some engine performance loss.
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Newbie
Joined: Oct 2018
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From: Denver, CO
C300
If you're really worried about it, just do a few partial fill-ups of premium as you use up the gas to further dilute the mid-grade you put in. Some stations sell even higher octane you could use to really mix with what's in the tank, but no need to go overboard.
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Super Member
Joined: Aug 2003
Posts: 772
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From: Bayarea, California
2003 C320 coupe/c450 in Feb 2016
sometime when i got a c300 or cla250 loaners, i put 87 gas, it saves me a few bucks.
yeah, i know some will say what about the next owner?
hey, when you buy a loaner, you kinda expected the worst.
yeah, i know some will say what about the next owner?
hey, when you buy a loaner, you kinda expected the worst.
