Mobil 1, cause you can get it just about anywhere and the price isn't to high, compared to other syn oils. Besides my 95 Neon engine went almost 500,000 miles when a piston broke which wasn't the oils fault.
I agree. I have been using Mobil 1 0-40 fully synthetic in my 2013 VW GTI as soon as the dealer stopped providing no-charge oil changes at 36,000 miles. I now have 150,200 miles on the car. Because I commute a lot, I change my oil between 8-10K miles. The reason I trust the product is that several years ago I tried an off-brand fully synthetic oil (factory weight spec of 5-30) and the engine had burned a full quart by 6000 miles. I know my engine and this wasn't normal at all. Switching back to Mobile 1 resolved that issue. To this day, I can go 10,000 miles on an oil change and burn just over a quart in that time.
I'm sure there are better oils than the Mobil 1 I'm running, but I can get the 5 quarts I need for under $30 and the better oils would cost me more. I'm pretty impressed by it and have no plans on changing.
