[weingarm]

I know this question may be in the wrong forum but there’s no response in the Z4 forum and I know the E46 community may know the answer since the S54 was based somewhat on the M54.

My father owns a 2003 Z4 2.5i roadster (M54 engine) with about 61,000 miles. Original owner, only adds about 2000 miles/year now. Runs great.

Keeps all the maintenance up-to-date.

Wants to know if or when he should be replacing the timing belt/chain and/or guides. I’m aware that other BMW engines have had issues with timing chains - is the 2.5i engine one to worry about?

Is there any other preventative maintenance he should be doing besides regular oil changes, brakes, etc? He’s already replaced the hydraulic pump for the power top which now works perfectly.