Originally Posted by kabob
10w-30 is perfectly fine. I don't get too fancy with motor oil since you're supposed to change it so often. Mobil 1 can be found at WalMart and doesn't have worse performance than the rest of the frou-frout synthetic oils.
Not sure I would run 10w30 with a turbo, remember when you are turning at 7,000rpm your turbos may be going 100,000 RPM, not to mention the added heat load. The two issues being that 10w30 is often bottom of the barrel in terms of quality, and it may be a bit thin under the heat loads that you are presenting.
I agree I wouldn't go crazy with expensive oils on a stock un-built engine.
As to periodicity, I plan on sending plenty of samples in to be analyzed, because I'm having a hard time with a 2500km oil life. For example in my 2006 F-150 with regular pseudo-synth Mobile 1 5w20 I sent a sample in at 7,500 miles, came back within spec. I lived in New Mexico at the time, so dust, extreme heat, etc. Pretty much a worst case scenario.
.....but I exceeded the mileage by a full 50% without hurting the oil.
Your oil gage should tell you what you need to know, I know that the oil in my car is too thick, the pressure sits at 8 on the gage until the car is up to temp when it drops to the expected 2, so I'm assuming its a 15w something, the hot side seem to be right, with pressure staying constant through a variety of temp ranges.
Going to change it to 10w40 and see how it acts this week.