I want to make it very clear that I am by no means an oil expert or tribiologist. On that note, I'd like to add that extended service intervals(5000mi >>) should always be accompanied by used oil analyisis to ensure that the oil is properly protecting your engine.
All of the information I've posted up regarding German Castrol was obtained through
www.bobistheoilguy.com and simple searches on Google.com. GC has generated quite a following on BITOG. It even has its own forum section there. Since it carries the neccesary VW approvals and is available through AutoZone, I thought it was worthy of mention here.
