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Interesting discussion. In most applications a collapsed hydraulic lifter makes enough noise that's it's impossible not to notice it. I'm puzzled when I read that 20 could fail without making a lot of loud rattling noises.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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