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i hear about the positives of synthetic oil
Which of these positives make syn oil worth the extra cost to you? Better frigid temperature performance? Better very-hot performance? Longer oil life? If you stick with ordinary oil drain intervals and don't have temperature extremes, there is little advantage to be gained over modern conventional oil. (I run syn oil in my turbo car with 10k oil drain intervals and in my motorcycle, and premium syn blend in my truck with 10k ODI. 200,000 miles on the turbo car, 115k on the truck, all running great.)