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.
Try using 5w30 castrol from walmart black container with green writing, since switched been driving 2.7k with in 2-3 month oil on the same level
I'm running 5qt 5W40 full synthetic oil (Castrol Edge, to be specific). The oil is changed yearly cause I never get close to the 10k miles suggested by VW for an oil interval.
Went to the dealer today and got this. 5 QTS CASTROL EDGE PROFESSIONAL 0W20 LONG LIFE IV (RED CAP) 1 VW Oil filter, Volkswagen 04E 115 561 H 1 Drain plug with washer $74.99
I ran Castrol 0w-40 euro blend for both my e46s and the stuff was awesome
I did an oil change at 6,300 miles on the factory fill. I sent it in for a UOA through Blackstone labs, but I'm not sure how to attach it here. The TBN showed some life still left in the oil, they suggested trying 8,000 miles next.
I would drain that oil with the Marvel in it and use use 0w-40 Castrol Full Synthetic (Made in Germany/Belgium). You can get a 5 quart jug at Wal-Mart for less than $25 usually. It's probably the best "over the counter" oil you can use in a VR6. Widely used and highly recommended.
I went with the Castrol Edge 0w-40 because it's a great oil with a good PAO content. It's also fairly inexpensive. I'll sacrifice the rebate on Mobil 1 as this oil seems to hold up better for my driving style over 10k miles.
I have a 98 TDI with 269k and I had an 06 TDI with 131k. I have dumped the unfiltered engine oil after each change into the tanks of both cars since I've had them (Beetle, 98, got at 230,880 miles). They burn fine.
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