1 second rattle at start up

[marck]

I've got this too on my 98, It seamed like it was more noticeable after my oil change, M1 0W-40. I might should check exhaust clamps too as noted.

[gqllc007]

Originally Posted by marck

I've got this too on my 98, It seamed like it was more noticeable after my oil change, M1 0W-40. I might should check exhaust clamps too as noted.

Mine was noticed right after my oil change as well

[jayspeed999]

My '01 S makes this rattle sound too. I believe it is the cam tensioners as others have said. A few of my BMW M cars did this too. I think it sounds cool.