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Originally Posted by Nosleepsheep
Thank you for all of the useful info! I'll use only H&R springs.
I have another question that has nothing to do with the above subject...I've noticed that my F12 rumbles and somewhat shakes when idling. I've read that it's normal for the N63 engines to rumble or shake a bit while idle...is that correct or have non of you had this issue?
When I bought it last night I think the dealer didn't put premium, and I've just topped it off with premium but it's still rumbling...it's not a smooth idle.
Should I be worried?!
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Sure man anytime!! The minimum requirement for the 650 is 91oct fuel so I hope you didn't put in anything lower. If you did just don't drive the car hard, just like a grandma until you're out of fuel and then fill a full tank of 91 or higher if you live in states that offer 93, then like Bonz said add a fuel additive like the chevron or I personally use Redline SI-1 and you should be good. If the problem persists take it back to the dealer and have them change spark plugs, injectors, check the Vanos, etc.