Castrol 5W40 was always mediocre oil. In that critical years with problematic rings it didn’t have MB229.5 approval like M1 0W40, which is far more demanding on deposits etc. I always got hate here telling folks that I would pick any other OTS oil than Castrol 5W40. It is for all intended purposes a budget oil.
As for VRP it did what supposed to do. However, we really don’t know what that oil leaves behind compared to Euro oils. Euro approvals are not just HTHS, but deposit limits, oxidation etc. MB229.5/51/52 are gold standard. If car requires VW502.00, my rule is always to get oil that has MB229.5 too.