ive been usin plus gas on my 300zx yr 94 auto,will it damage anything??help thanks.also my rpm when i first start it will start up but goes down almost stall but doesnt..that anything to worry about??

 

as in 91 or 93 octane? shouldnt you be using that anyway?

 

you mean mid grade?

i've run it back in the day when i was commuting a lot, but knowing what i know now about the dangers of it (detonation and shattered pistons) i no longer do.

 

ive been using 89 plus instead of 91 supreme..will it damage anything??ima start using 91 supreme now just to be on the safe side

 

YES it will damage your motor. If you have an NA, it's a high compression engine, requiring high octane. If you have a Twin Turbo, don't even think about it, just run premium or you will detonate your engine.

You bought a Z32, not a Civic. There's a reason it says "Premium Only" in the owners manual (and probably on the gas cap, too, I don't recall for sure).

 

alright i will use premium from now on..but its full with plus gas for right now,you want me to drive it till its hits E then fill it up with supreme or what?

 

Just go easy on the throttle. The car can obviously run on improper fuel, but the risk of detonation is higher. So until the tank is sufficiently low (you don't have to wait until E, the fuels will mix thoroughly), just drive like a normal person... no full throttle bursts.

Why would you even put cheap gas in the car anyway? You might save $0.20, but that's a tiny savings for the huge risk of a $1200 motor + $800+ (easily) to replace it.

By the way, your near-dying problem at start-up could be a vacuum leak, bad spark plugs, etc. My recommendation there is a basic tune-up... next time you change the oil, also clean your air filter, clean the throttle bodies, clean (or replace) the spark plugs, clean the MAF, etc.

 

forsure.thanks for helping me out.i just bought some octane boost and put sepreme in there as well.but yea im going to tune it up real soon

 

octane boost has a reputation of damaging O2 sensors. 92 octane is just fine for your car.

not to mention, running octane other than what your car is tuned for doesn't benefit anything.

 

There is no 91 octane fuel in Lebanon .. minimum octane level is 95!! i am running 98 octane sometimes too !!

 

is that bad?im using lucas brand octane.to me its running way better

 

is what bad? i just explained to you that it could be bad. if you don't need it (you don't) then don't take the risk. you go from one bad gas to another bad gas. what you need to put in your car is plain clean unmixed premium 92 octane. that is all.

 

I use lucus fuel treatment all the time no problems at all.. If you want a extra kick on the weekend cruises ... i put in NOS Off road booter for that extra kick ... You wont know until you try it ... I use it inmy 1993 300zx n/a/

 

oh man, i forgot. this guy's right ^^^.