Porsche ownership notes: IMS bearings on the 986 and 996, rear main seals, air-oil separators, Cayenne coolant pipes, and how to pick an independent Porsche shop.
You can own a Porsche without going broke. The trick is knowing which generation you have and what that generation does.
986 Boxster and 996 911 (M96 engine)
- IMS bearing. The famous one. Read our IMS guide for what the retrofit includes and why quotes range so widely.
- Rear main seal (RMS). Leaks are common. Usually fixed at the same time as a clutch or IMS job since the transmission's already out.
- Air-oil separator (AOS). When it fails you can get smoke at startup and odd idle. Not super expensive.
- Coolant expansion tank, water pump, radiators that pack with debris up front.
987, 997 and later
Later engines dropped the removable IMS design (the 9A1 engine has no IMS at all from about 2009). Bore scoring gets discussed on some 987 and 997 engines, and opinions differ on how common it is. A pre-purchase inspection with a borescope is a good idea.
Cayenne
Early V8 Cayennes (about 2003 to 2006) used plastic coolant pipes in the valley of the engine that crack. Many have been replaced with aluminum. If you're shopping one, ask.
Basic maintenance
Oil to Porsche's approved spec, brake fluid every two years, and spark plugs on schedule (some engines need a lot of labor for plugs). Keep paperwork. On a Porsche, records are part of the car's value.
Picking an indie
Ask how many of your exact model they see per week. Ask if they have PIWIS or equivalent diagnostics. And for the M96 cars, ask how many IMS jobs they've done. Experience matters a lot on this brand.