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Mobil 1 Advanced Full Synthetic 15W-50 is a full-synthetic engine oil in a thicker grade aimed at older, high-mileage and performance engines. It resists thermal breakdown and sludge better than conventional oils and holds viscosity under hard use. Reviewers value its shear stability and cleaning additives in older engines, though the thick grade costs a little fuel economy and is not for modern engines that call for 0W-20 or 5W-30. It suits warm-climate, classic and track-day use more than everyday late-model cars.
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Lowest price we've seen: $39.88 on Nov 9 at Walmart. Tracked across 1 store since Nov 9.
Owners of older and performance engines report clean internals, steady oil pressure and less consumption between changes. Some note the thick grade is slow to circulate when cold and not ideal for modern engines.
