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In the morning upon warming up my 06 M6, I hear a quick "tick tick tick" sound come from the rear. Sounded like rear strut mounts but not sure, it ticked again while i reversed out of my driveway and only does so when the car is not warmed up. It also won't do it unless I go in reverse while the car engine temp is still cool...
Any ideas on what this could be?? :confused
 

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my guess the reverse gear has a problem, might not be major so don't start freaking. and the extra wear and heavy cold oil ,90w when its cold is real thick creates more drag. take it to your dealer at your next service or before it goes out of warranty. let him keep it over night or weekend. let them take a look at it. it seems like most cars-pickups have a gear whine in reverse. dunno why, but the exra gear might create that much more noise
 

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I also have a 2006 m6-I hear a knocking sound when the car hasn't warmed up yet-usually at a red light 1/2 mile from town-when I am coasting to a stop or stopped-comes from the rear-?maybe gas tank area?:willy:
 
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