The Meyle HDs have a 4 year warranty on them. My guess is that whatever goes in at this point will last longer than most of us will own the e53s.

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2001 X5 Sport 3.0/5-speed
1998 318ti/5-speed
1988 735i/5-speed
1984 528e/5-speed (soon to be M20B25-powered 525i!)