[porsche tech]

Fact: more than one poster has said they’ve used the manufacturer’s recommendation of 0/20 for over 150k or 200k miles without issue. That must be worth something? I also used Castro 20/50 for well over 100K miles (on a 1973 vehicle). Times change and so has oil.

As one poster says, “trying to outsmart factory engineers” usually doesn’t work. After 42 years of Porsche wrenching I have seen many Porsche owners change shocks, springs, sway bars, etc only to make an ill handling, rough riding, squeaking, clanking mess. It only takes money to mess up a nice car.