My Current Favorites are:
1) Mobil 1 0w-40. This is a great oil, but some have had high consumption with it, others can't find it.
2) Mobil 1 Truck & SUV. Easier to find, shouldn't have any consumption issues, a bit heavier than the 0w-40 and generally available at Walmart for $22.88 in the 5 quart jug. I am currently trying a mix of this and 0w-40.
3) Castrol 0w-30 aka German Castrol. You have to be careful with this one as there are two versions, a US made Group III and a German Made Group IV oil. If you want to run this one you have to look carfully at the back of the bottle for those magic words "Product of Germany" or "imported from Germany". The back will also carry BMW LL-01, MB 229.3 and 229.5 approvals.
4) Shell Rotella T 5w-40 Synthetic. This is a group III oil that has turned in consistantly good results at bobistheoilguy.com. It is the value leader of the bunch when you can get it at Walmart for $12.88 per gallon. If you have to buy it at $5.00 a quart, buy one of the others above.
Mineral Oil:
The major brands are all getting pretty good. If you are in a mild climate (temps above 40F), the Chevron Delo 400 15w-40 appears unbeatable, and many times turns in numbers close to the synthetics. For those in colder climates, in the winter, run a 5w-30 if you use mineral and pick your choices from Chevron, Havoline, Pennzoil, or Mobil. The only reason I don't mention castrol GTX is their mineral oils seem to have pretty crummy low temp pump specs. Valvoline is excluded because their All Climate has shown poor performance, but the Maxilife is supposed to be pretty good and is available in 5w-30.
RAVENTAI, YOUR THOUGHTS, ADDITIONS, ETC????