I used 87 octane accidently:banghead: last fill up, I did not notice any difference. allthough i do not plan on using it regulary, I feared the worst when i relized that i used the wrong grade. Now that i have used the whole tank and didnt notice anthing bad happen i am glad.:redspot

I used 87 octane accidently:banghead: last fill up, I did not notice any difference. allthough i do not plan on using it regulary, I feared the worst when i relized that i used the wrong grade. Now that i have used the whole tank and didnt notice anthing bad happen i am glad.:redspot


Your engine is going to blow up in a few. Be careful :buttrock

How did you remember what grade u used half way through a tank of 87?

Now you have thrown your fuel trim and timing out of wack until u go through 2 tanks of the good stuff!

You should be fine. The ECM will detect knoking and retard the timing to compensate. Light pinging at patial throttle is common in many cars, but not dangerous. Heavy pinging at 3/4 to WOT is very bad and can wreck things; I cracked a piston right under the first compression ring, had almost no compression in the cylinder and that was due to some heavy detonation and a heavy foot. BTW, it was a Toyota with Ertle pistons.

[quote=Alpina540i;10917083]How did you remember what grade u used half way through a tank of 87?

:nono

I relized after pumping about 13gal then switched to 98 for the remaining 4gal

[quote=Alpina540i;10917083]How did you remember what grade u used half way through a tank of 87?

:nono

I relized after pumping about 13gal then switched to 98 for the remaining 4gal


you guys have 98 octane in FL? damn, looks like i'm moving.:)

I don't understand why you think this is an issue...it clearly states in the owners manual that 87 AKI (at a minimum) can be used.

BMW recommends a higher octatne fuel...but at a minimum, 87 AKI can be used (with decreased performance and usually poorer gas mileage). The engine will automatically adjust timing to compensate for any engine knock.

http://www.bimmerboard.com/members/q/original/Fuel%20Specification.jpg