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    Is 5w40 full synthetic safe for non-turbo car?

    I have a 2007 Hyundai Elantra with 56000 miles on it. Since I bought the car from 28000 miles, I've been using full synthetic 5W30 the whole time. I used 12 qts of Penzoil platinum ($1 after rebate per quart), 12 qts Mobil1 from Costco (cheap after coupon), 5qts G-Oil (free after rebate). I...
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