Questions to those with a 318is : what kinda gas ?

[royalflush313]

So when I got it I filled up with a 89, but then afterwards I noticed that BMW receommends premium (91?) on the 318is.

Do all of you actually put in premium or higher in the car, or just use regular 87 or 89 ?

With the gas prices now, I'd probably save $5 each time I fill with a 87, but if there's a reason why only the 318is needs premium, i wouldnt cheap out on gas.

8)

[Rob]

My car had detonation on the dyno with 87 octane, so run at least 89 to be on the safe side. If you have a chip, definately run premium

[bimmerphile]

Dude, B M W


don't skimp on gas

[318daily]

mine was chipped, so i used 91.

i would only put 87 in a rental car.

[Rob]

Dude, B M W


don't skimp on gas

LOL

[KenC]

The octane numbers in europe are different than in the USA. In europe they use RON and in the USA we use PON. 91 RON = 87 PON. Thus, the manual states to not use anything lower than 87 octane here in the USA.

[e30Matt]

I think 87 is the lowest you can get... but I run 93 without a doubt

[nando]

91.. the M42 has a fairly high compression ratio (10.1:1 or something). even stock you'll get detonation if you run cheap gas. contrast that with the M20's 8.8:1 ratio...

[SykoBMW]

The octane numbers in europe are different than in the USA. In europe they use RON and in the USA we use PON. 91 RON = 87 PON. Thus, the manual states to not use anything lower than 87 octane here in the USA.

I guess my dads M3 is supposed to run on 87 then too? :roll: I know they're different, but they do call for premium.

[Rob]

your dads car would probably be fine on 87.....modern ECUs have knock sensors that pull timing when knock is detected, preventing engine damage. Our cars, not so much.

[///M42 sport]

I've run 89 a couple of times due to the high prices and haven't noticed any negative effects.
________
Fix ps3

[Streetspec_iS]

i run a 98RON. which is about equivalent to a 91 in the US books. run a bit of octane bost every now and then. cleans the injectors out a bit if nothing else.

[BS87]

I run 89, minimum, and only because i can't find a gas station withing 50 miles of me that sells 91

[e9nine]

93 or 91 religiously

[LikeCDoos]

91 for me with my JC chip