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I'm not an engine expert but FWIW.
If you are pulse and gliding using big throttle openings and low rpm you are loading the bearings in your engine more than the average person. Also oil pressure at low rpms can be lower than at "normal" rpms. Plus if you are going to thinner oil that is less able to keep bearing surfaces apart you might have a recipe for trouble. You are creating the toughest environment for the oil to work at.
Also the first number in oil weight tends to be the base oil weight and the second number is achieved through additives which can break down leaving you basically running with the base oils weight. So your 0W20 may be just 0W0 after some amount of miles.
So 0W20 oil run for a many miles at high load, low rpm situations may result in scuffing a bearing which could be a career ending injury for your engine.
I second the oil analysis to find out for sure how the oil is doing over a longer change interval, just to be safe because you'd have to save alot of money on gas and oil changes to pay for any type of oil related engine work.
Ian
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