Just curious, I have a 1977 MG Midget with a 1500 engine. I've always used 20W-50, since the owner's manual says to use that above 60 degrees F. Below that you can use 10W-30. Would 10W-30 be okay over 60F? Only reason I ask is it seems like it takes a second or two for the oil pressure to register, although I don't know if that's because of the skinny capillary tube running from the engine up to mechanical oil pressure gauge. This engine is rather notorious for wearing out bearings (crank, rod, and thrust), but would 10W-30 improve the time to build up oil pressure, and still give sufficient pressure at idle when hot? Normally it's about 20-25 PSI when hot at idle.