Oil choice (20W-50): Castrol GTX or Valvoline VR1?

[red 69]

I use VR-1 20-50 racing oil in all my older cars without any mishaps for years .. my daily driver

1969 911 rsr my shovelhead harley and my 93 xjs jag ..perfect oil

[jlex]

Originally Posted by Nick Triesch

Just use the oil made by Porsche for our classic cars, Porsche classic motor oil in the cool can! Porsche created these fine oils just for our air cooled cars.

Does their oil contain zinc and phorphorus??