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If your mechanic thinks replacing an AOS is difficult, wait until he reads the procedure to replace a head gasket!!! Not to mention the "special" tools.
Although I agree with the leakdown and pressure tests, sometimes a simple compression check is enough to id a blown head gasket. In any case, they rarely blow in pairs.
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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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