Quote:
Originally Posted by K-M3
could it be the octane rating?? BMW recommends premium grade gasoline and 91 aint exactly premium, definitely not if it has some ethanol in it. And i myself am not really sure about this thought but i was thinking about it. could it be engine knock (and I know that the M3 has anti-knock sensors) from a lower octane than what it should be (atleast a 93-94 or higher). A clicking/ticking sound at part throttle/low rpm is very consistent with engine knock from bad quality fuel.
Are people on this forum using the 100 octane/91 octane blend also having this problem? or does this make it go away.
like I said before, there is just way too much of a consistent association with this noise and the break in service. I absolutely cannot fathom why or what will cause this to happen after the first service but the association is there!!!
@ derric - after you got the crank and bearings replaced, you said it came back after 3 months. did it come back again after another service/oil change ??
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WTF!!!
You might be on to something here. I just filed the tank with Mobil 93 octane instead of BP 93 octane and the sound is gone!
I need to go out and do another test drive to make sure.