I watched a video about valve stem seal replacement. Yes, looks like a royal PITA to even just remove the valve covers. Too bad.

What percentage of these cars are having this issue at this age? Pushing 16 years now... I guess it's a matter of time on all of them since the rubber seal degrades.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa