O-ring is thin and oval-shaped.
Do you check compression cold or hot?
Have a few invoices from '90s-- Jim Fisher Volvo of Portland OR. 2000 to mid 2008 was Larrys Independent. Last two invoices Summer 2009 were Louis Foreign Car Repair. This was who did the recent comp test and worked on the GP system. Oil changes since 2003 were done by previous owner, usually 2-3000 miles, since 2006 he used a blend of synthetic/dino.
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