barman85

Has anybody put anything other than 92 octane in the tank? What happens when you put a lower octane in? What happens when you put a higher octane?

WayneE

If you drive gently, nothing happens. The car runs as normal. If you accelerate quickly/apply heavy load to the engine, you will get some knock activity. The ECU will detect that knock activity, reduce timing and reduce power.



There is a set amount of timing advance built into the ECU. It will not advance the timing past that point, which is set for high octane pump gas (91-92?), so using higher octane (like race gas) is useless.

Kevin M.

I was burning 93 in Europe, and 91 here in Cali, can't tell a difference.

shanetoast

If you dont put anything better then 91 in your car you shouldnt be driving a benzo. We just talked about this in another post.. look for Gas???.

mrademacher

I've only put 91 in my car so far. I shouldn't be driving a benzo! ? Should I give it to you? Maybe than you can put higher octane in it.

shanetoast

No but im just saying if you can afford the extra 0.02cents per gallon. Then the car isnt for you.

lkirchner

Here in the Central Valley 91 is the only crap that you can buy but the air sure is clean.

vraa

The idea of putting lower octane into your tank has been discussed quite often, just do a search

If you get a ECU tune, you can run higher octane gas with decent results.

mebeJOE

S.Toast: Are you in So Cal? I live near Long Beach -- where do you get higher than 91 octane gas?

To Anyone: Will my SL500 run better on 93 octane or is it just helpful to cars with a higher level of tuning -- like your AMGS?

shanetoast

I have a friend that lives in La Habra, and theres a gas station where he lives that has it. If your serious about getting the gas i can find out the cross streets for you. There actually is a place its a 76 gas station it has 100 octane, i used if for my dirt bikes. Its on the border of North longbeach and Compton. They dont have it at the pumps you have to go in and ask for it. I take a 5 Gallon jug and the fill it up. In your case it will be your car. Good luck i hope you find the gas station. If you still need help PM me and ill do my best to try and find the gas stations exact address for you.

mebeJOE

There is also a place in Pasadena, a 76 station, that has 100 octane racing gas -- it is right at the end of the 110.

But I was under the impression that you were using 93 octane in your car. I guess I misunderstood.

Will such high octane hurt the engine? Or is it a general rule that the higher the octane, the better?