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I recently purchased a 91 Stealth R/T TT and it is now time to change the oil. Oil capacity is 4.5 quarts, I was planning on 1 quart mobil 1 15w-50, and 3.5 quarts of 10w-30. The reason for the 15w-50 is to thicken up the 10w-30 which I believe is just a little to thin for a high horsepower...

My brother just bought a 04 Polaris Sportsman 500 H.O. and was wondering what type of oil to use in it. I figured he should change it with dino oil for the first oil change, and then switch to a synthetic. It will be used in -20F weather during the winter.

I have a 85 Jeep Cherokee with 160,000 miles with a 2.8L V6 that doesn't consume oil and will be used for winter trasportion. Most of the driving will be in town from 10-20 miles per trip. My question is would a dino 5W-30 work for -35F(the extreme)start ups, or am I better to go with a synthetic?