My 10k UOAs on Castrol 5w40 were just fine, but VW 504 is mid-saps so it might not have as much staying power even thought it's "better" oil.
Our Tig is coming up on it's 4th change (every 5K) and hasn't lost any significant amount between changes. So far all changes have been the 508 spec Castrol 0w20.
I really like Castrol oil. I used the VW High Performance twice, and it was fine, but I still preferred Castrol.
I use the red bottle in mine. I've found that it leaks/burns the least.
I have the VR-1 race oil on my MR2. Apparently some people said it made my car spit flames.
The approach to go with 10W40 is absolutely right - from my experience the best oil for that kind of engines! Take an expensive Castrol Magnatec Oil and it runs well.
Me personally I'm using Valvoline euro full synthetic 5w 30
Me personally I'm using Valvoline euro full synthetic 5w 30
As an aside, all the oil used to be Castrol and has now transitioned to a VW boxed product produced by Mobil 1. THAT is the correct oil.
I've switched to Castrol Magnatec 10W-40 which seem to do better wrt oil pressure.
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