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I need to change the oil this weekend. Mine had always taken exactly 4.5 quarts to bring it to the full mark on the dipstick. I have 4 quarts of Pennzoil Platinum 10W30 left. I have some leftovers laying around......half quart of Pennzoil Platinum 5W20, about a quart of Pennzoil High Mileage (conventional) 10W40,and a half quart of PYB 10W40. Which oil would you use for that "half quart"? Would a half quart if 5W20 be harmful at all?
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