My '04 X5 3.0's engine is a quiet as a church mouse, no problem with it.

But, by comparison, my '01 330 M3 (42K miles) has a real loud timing chain rattle on cold start until the engine (chain tensioner?) gets oil. I say its a tensioner problem, but the local dealer says its normal. I'm about to trip the 4 yr part of my warranty..........and firmly feel that today's normal will become a problem in 3 weeks.

Any one out there with an M3 similar year and mileage that can advise me. i dont recall hearing the noise till just under 30K on the clock, at that time the dealer again said "normal".

Thanks for the help......