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 run Liqui Moly 2044 Touring High Tech Diesel 15W-40 Motor Oil - 5 Liter Jug in mine since I bought it at 136k. Now at 164k and it purrs.
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 went with Liqui Moly 2332 Leichtlauf High Tech 5W-40 which meets 502 spec. This. German-made. 502 spec. You can get a jug of the stuff on Amazon for a good price. Been using it for over a year now.
LiquiMoly Leichtlauf High Tech 5W40 Easy DIY kits sold online for ~$70 delivered including VW filter and drain plug, has a good reputation in the VAG community
I just did my first oil change at 1k miles. I went with Liqui Moly 2332 Leichtlauf High Tech 5W-40 which meets 502 spec.
I typically use Castrol Edge 0W-40 at 5000 mile change intervals unless my annual service interval comes up at the dealership.
I personally use the Castrol 0W-40 that meets the VW 502 spec. Per the Bob is the Oil Guy forums, it’s one of the best oils out there and is available at a great price from Wal-Mart, at ~$25 per 5qt jug. I’d use this oil in any VW and not think twice.
I've been using the Liqui-Moly 5w-40 Leichtlauf High Tech since 2500 miles.
You want to know how your oil is doing? Send it to Blackstone labs for testing. Cost $35 but worth it in my opinion. I send my 8k oil (Liquy Moly, from my CC) and it was still very good!
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