Would appreciate opinions from the educated masses. I have a 94 Celica, 1.8, 4 cyl, 5 speed, manual. Owners manual states 10W-30. My concern is that at 60mph in 5th gear, I am turning 3000 rpms. Most 6 and 8 cyl engines turn about 2000 rpms or less at that speed. When shifting in traffic, engine revs to 1500 to 2000 rpms. (More chance for oil shear?) I do not gun it. Toyota engines seem to produce more heat than the average engine. I do not have an actual heat guage with temp markings, only the C and H guage without actual temp. Guage indicates normal op temp, but you can feel heat. I feel guage is correct. Car is driven in severe conditons. 2000 miles per month, heat, stop and go, short trips. I have only owned this car for 6 months and need the best brand and viscosity oil to protect the engine. Due to severe driving conditons, I prefer 3K oil changes. Would appreciate advice. Thanks!