I've been doing 7k. Seems to work for me. I just did the clutch an IMS at 72k on a '99 base. The mechanic said the IMS was going but not gone. I don't think the previous oil had any adverse concequences on aging parts
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'99 Boxster Artic Silver/Red
'14 Subaru Outback
'06 EG Classic
'05 Sportster
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