sorry if it has been mentioned before i couldnt find it - I even googled it and didnt get anything back..
ive just bought an R34 25GT-T and loving it. However, im not sure if i MUST use 98 octane on it or not.. i had a 300zx which will backfire/misfire (not sure which is the correct term) when using cheap unleaded.. Im not sure what i should be using.. if I must use 98 and used cheap unleaded, why would it be bad? engine problems or just blocked injectors or fuel ignites in exhaust?
thanks in advance