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Currently running 10w-60, still burning oil pretty fast. Want to try Amtecol 9000N 0w-20. My gearing is fairly short so I'm turning almost 4k rpm on the highway, barely getting 21mpg, curious to see how much 0w-20 will help. Was also thinking, if the rings are worn, shouldn't a thinner oil be...

i read somewhere that if you dont drive your car much you should use conventional because it leaves a layer of lube on the metal parts, so the next time you start up there wont be any grinding or wear, i only drive my mustang about once every other week and i drive it hard, off road use at the...