Put wrong gass in c300
Thread Starter
Newbie
Joined: Oct 2019
Posts: 4
Likes: 0
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
Likes: 139
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.
Trending Topics
Newbie
Joined: Oct 2018
Posts: 3
Likes: 1
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.
MB World Stories
The Best of Mercedes & AMG
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke
Verdad Gallardo
8 Mercedes Models With Poor Reliability Records
Verdad Gallardo
Super Member
Joined: Aug 2003
Posts: 772
Likes: 81
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.
