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Mobil 1 High Mileage is a full synthetic 10W-40 aimed at engines past roughly 75,000 miles. It uses a higher-viscosity grade and a seal conditioner to slow leaks and reduce oil burning in worn engines, and it carries extra anti-wear additives and detergents compared with Mobil 1's standard synthetics. It suits older cars, trucks and four-stroke engines that call for 10W-40, but it is not for engines specifying 0W-20 or 5W-30. Reviewers generally rate it as a dependable, long-lasting oil for high-mileage engines; the main complaints are the thicker cold-start flow and the fact that it is not for modern engines with tight tolerances.
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Lowest price we've seen: $29.91 on Nov 9 at Walmart. Tracked across 1 store since Nov 9.
Owners of older cars and trucks mostly report quieter running, less oil burning and fewer drips after switching. Some note slower cold starts in winter and say it is not a fix for serious leaks.
