BMW 3 Series Forum - Technical Talk on the BMW E21
Hi. mine is a e36 95 318is (german spec). here in my country are 2 types of fuel, 87 octane and 80 octane.
I have always used 87 octane and got crappy 16 mpg. this weekend i didnt have a choice and filled the tank with 80 octane fuel and i got 22 mpg.
1. will 80 octane fuel damage the engine...