Quote:
Originally Posted by porsche tech
I also used Castro 20/50 for well over 100K miles (on a 1973 vehicle). Times change and so has oil.
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+1 Castrol GTX 20W-50 is on my shelf for a old odd ball car I have.
I would say if you use a thicker oil, start-up very easily until it flows "better". I think in some way-back Porsche/VW manual or tech discussion they said let the car idle the amount of time to roll a cigarette.
FWIW, I did not bolt down a VVT solenoid once as I was going to replace it (few weeks ago - summertime). I started the cold car to move it and the pressure blew the solenoid out of the hole and half emptied the crankcase in a matter of a few seconds. There is a lot of pressure and even thicker oil will move fast. That's a layman talking.