87 O vs 93 O, 93 O wins.
#1
Senior Member
Thread Starter
87 O vs 93 O, 93 O wins.
Got caught on just about empty and wasn't near my discount gas station, so I took a shot and put in 2 gallons of regular. I reset the trip indicator to see how the car did with regular. The next day I filled the car with 93 octane and reset the trip indicator. Not only did the car feel as though it was performing better (purely subjective,) but the mpg increased by about 3-4 mpg (purely objective.)
#2
Interesting to know.
Ive debated about putting the 91 O fuel in , but I fear anything less than whats called for (92) could jeopardize the engines long term performance?
I wonder how true that could be ... but then again with a car like this im not sure its worth chancing it.
Ive debated about putting the 91 O fuel in , but I fear anything less than whats called for (92) could jeopardize the engines long term performance?
I wonder how true that could be ... but then again with a car like this im not sure its worth chancing it.
#3
Member
Got caught on just about empty and wasn't near my discount gas station, so I took a shot and put in 2 gallons of regular. I reset the trip indicator to see how the car did with regular. The next day I filled the car with 93 octane and reset the trip indicator. Not only did the car feel as though it was performing better (purely subjective,) but the mpg increased by about 3-4 mpg (purely objective.)
I'd be interested to hear your results comparing 91 AKI and 93 AKI... Theoretically there shouldn't be any difference but I'd be interested to see if there were.
Interesting to know.
Ive debated about putting the 91 O fuel in , but I fear anything less than whats called for (92) could jeopardize the engines long term performance?
I wonder how true that could be ... but then again with a car like this im not sure its worth chancing it.
Ive debated about putting the 91 O fuel in , but I fear anything less than whats called for (92) could jeopardize the engines long term performance?
I wonder how true that could be ... but then again with a car like this im not sure its worth chancing it.
#4
Junior Member
It says right on the fuel filler door that 91 is the recommended minimum (or something to that effect). Here in Ontario you can definitely get 93 if you look for it, but at most stations 91 is the top premium. I have been told a number of times that 93 is not worth the extra money.
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#9
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2017 C300 Coupe - Polar White/Saddle Brown (Premium, Premium Plus, Sports AMG package)
That is my understanding as well that the higher the octane better response time from engine due to faster ignition of the fuel...
#10
Member
The C300 2.0L engine has a relatively high compression ratio of 9.8:1. The high compression of the motor requires the higher octane gas for it to function properly.
The use of lower octane gas will cause pinging, engine roughness, loss in performance, and potential irreversible damage.
The use of higher than recommend octane does nothing as well. Since the goal is to prevent the gas from igniting prematurely due to pressure, there is a perfect Octane rating to achieve that - and the car manufacturer has already figured that out for you. Using any Octane rating higher than that won't get you anything because the gas is already igniting at the optimal time.