Put 110 octane race fuel in my M, started misfiring BADLY!!
I had some race fuel in my race car, and was going to put in fresh fuel for this season. So, I drained it, and just tried it in my X5M. Ran very well for the first 1/2 hour or so. Seemed like more power, than just 91 octane fuel. After the tank was almost empty, started misfiring like CRAZY!!! Just misfire on cylinder 6 only. Kept doing it over and over, and got the reduced power, warning, etc. etc. The thing then didn't go over 30 km/h , LOL. Filled it with 91 octane, did the same thing for a few miles, now drives fine. Bottom line: Don't put race fuel in your street car! hahah.
But also making some weird weird noses, when I shut it off. Will post some vids of it soon. And, the water pump or something was making some awful gurgling noises, I've never heard that before as well.
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