Oil leaks from everywhere
Symptoms
Oil spots on the driveway, oily residue on the underside of the engine, falling oil level.
Cause
Every seal and gasket is four decades old. The PRV V6 is notorious for leaking from the camshaft seals, valve cover gaskets, front and rear crankshaft seals, and oil pan gasket. The cam covers are alloy and can warp slightly, making leaks worse.
Fix
Systematically replace all gaskets and seals.
Cam cover gaskets are easy.
Camshaft seals require timing cover removal.
The rear main seal is an engine-out or gearbox-out job, so do it if you're already in there.
Use quality gaskets, cheap ones won't last.
Clean all mating surfaces thoroughly before reassembly.
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