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With respect to oil viscosity: A while back, someone on this site referenced an "expert opinion" piece by an oil expert (engineer?). In that write up, the expert said that 0-30 would be preferable to higher viscosity oils because it flowed easier. He said that because the oil flowed easier, the oil pump would be able to push more oil thruout the engine. Further, because the oil flowed easier, oil pressure would be higher in the bearing surface areas such as the rod bearings and main bearings. The 0-30 would also be better at start up.
Well, I normally run 10-40 Mobil 1 Full Synthetic in my vehicles and change the oil at 4000 to 5000 mile intervals. It was time to for an oil change in my 3500 Silverado, 6.0 gasser. So I tried out his advice. 6 quarts of Mobil One 0-30 and a new oil filter into the truck. Normally, this engine is very quiet and smooth, no rattles or lifter noise. Now with new oil, lots of lifter noise and other engine rattles (Mains? rods?).
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