5W-40 is now thought to be best for all model years, if for no other reason than 5W-40s are mostly the ones with VW approvals, IIRC M-1 0W-40 may be the only non-5W-40 with a VW approval. A lot of people think M-1 5W-30 is not as good as the M-1 10W-30.
1) The county where I live (Mendocino, CA) is noted for it's biodiesel production and availability. They use recycled french frying oil and cooking oil. It's amazing to be down at the fishing docks and here comes a fishing boat putting along. Where you would expect to be covered with a nasty diesel cloud you instead get hunger pangs as the smell of McDonalds fries wafts over you! Diesel Jettas abound that are running biodiesel. Smells like a french bakery. Very cool. Actually biodiesel has no nasty pollutants because it has zero sulfur content.
2) In WWII the Germans were chronically low on petroleum oil. They developed carburators for their transport trucks that ran on.... smoke! I remember seeing a film with a couple guys sitting the fenders feeding hay and bits of wood into the engine as the truck cruised along.
I've been using it since 15,000 miles and now have 115,000 miles (chipped btw!)
I did an used oil analysis at 100,000 and the engine was like new. I'd run between 7-9,300 miles on a change. The analysis did note that at the 8100 mile sample my additive package was about depleted.
If you do go Mobil 1 the 0W 40 is the way to go.
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