Im still trying to fix my start up rattle on my 2001 4.4 e53 with 133,000 miles
I have Replaced the tensioner and made sure the oil is topped off.
It only rattle after about 3 hours of being shut down. Im 2000 miles in on the 0 w 40 oil.
I read here that you can fix it by switching to 15 w 50
I live in south washingtion and the winters never get below 25 degrees usally about 50 degrees
540i startup/VANOS rattle SOLVED with switching of oil