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Mobil 1 Advanced Full Synthetic 15W-50 is a full synthetic engine oil in the thicker 15W-50 grade, sold here as a four-jug case of 5-quart bottles. It is built for older, high-mileage and performance engines that call for a heavier oil, and it holds up better than conventional oil under heat and hard driving. Compared with thinner 0W-20 and 5W-30 oils it gives more film strength at high temperature but costs fuel economy and cold-start flow. Owners of older sports cars, air-cooled engines and tow vehicles are the usual buyers.
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Lowest price we've seen: $127.88 on Nov 9 at Walmart. Tracked across 1 store since Nov 9.
Owners of older performance cars and high-mileage engines report the oil holds pressure well and stays clean between changes. Most criticism centers on the thick grade and the large case size rather than the oil itself.
