AMSOIL 10W-30 100% SYNTHETIC HIGH-MILEAGE MOTOR OIL

AMSOIL 10W-30 100% Synthetic High-Mileage Motor Oil delivers targeted cleaning, seal conditioning, and wear protection for engines with over 75,000 miles. It is built to address the specific problems that develop as engines age, helping you get more reliable miles out of vehicles that still have plenty of life left.

Older engines accumulate sludge and deposits over years of operation, and seals harden and shrink with age. Compression loss from cylinder and ring wear reduces horsepower, while oil consumption creeps up as thermal stability becomes harder to maintain. A conventional oil or even a standard synthetic may not be formulated to tackle all of these issues at once. That is where a purpose-built high-mileage formulation earns its place.

CLEANS UP DIRTY ENGINES
Sludge and deposits rob engines of efficiency and shorten component life. AMSOIL 10W-30 100% Synthetic High-Mileage Motor Oil uses a boosted detergent and dispersant package specifically designed to break down and remove accumulated deposits, helping restore performance in engines that have seen years of use. In a modified Sequence VH test (ASTM D8256), AMSOIL High-Mileage Motor Oil reduced sludge by 67% following an oil change during the cleanup phase of testing. That kind of active cleaning means your engine does not just stay where it is. It actually gets cleaner over time. Independent TEOST 33C testing (ASTM D6335) showed AMSOIL High-Mileage Motor Oil produced only 15.4 mg of total deposits, compared to 39.3 mg for Valvoline Full Synthetic High Mileage with MaxLife Technology and 40.5 mg for Mobil 1 High Mileage. That is up to 62% better deposit prevention than two of the most recognized high-mileage oils on the shelf.

MAINTAINS VISCOSITY UNDER STRESS
As engines age and clearances open up, maintaining a consistent oil film becomes more important. Thinner-than-expected oil film accelerates compression loss and increases metal-to-metal contact. AMSOIL 10W-30 High-Mileage Motor Oil is formulated for durable viscosity that holds up across a wide temperature range. With a high-temperature, high-shear (HTHS) viscosity of 3.4 cP (ASTM D5481), it maintains proper film thickness even during high-RPM, high-load operation. This is particularly relevant for older Toyota 4Runners, Chevy Silverados, Ford F-150s, and similar trucks and SUVs that see hard use well past the 100,000-mile mark.

CONTROLS OIL CONSUMPTION
High-mileage engines are prone to burning oil, especially under sustained highway driving or towing. AMSOIL 10W-30 High-Mileage Motor Oil resists thermal breakdown and volatility, which are the primary drivers of oil consumption. NOACK volatility testing (ASTM D5800) measured just 4.5% weight loss, a notably low figure that helps keep oil in the crankcase where it belongs rather than exiting through the exhaust. For drivers tired of checking and topping off between changes, that stability makes a measurable difference in how much oil stays in the engine over a full drain interval.

CONDITIONS SEALS TO HELP PREVENT LEAKS
Oil spots on the driveway are one of the most common complaints from owners of high-mileage vehicles. Hardened, shrunken seals are usually the culprit. AMSOIL 10W-30 High-Mileage Motor Oil includes a boosted dose of seal conditioners that help restore flexibility and proper fit to aging gaskets and seals. This helps reduce or stop minor oil seepage without requiring expensive seal replacement, a practical benefit for anyone keeping an older Honda Accord, Toyota Camry, or Chevy Tahoe on the road.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL 10W-30 100% Synthetic High-Mileage Motor Oil is API licensed and meets or exceeds the following specifications: API SQ, SP, SN Plus and earlier; ILSAC GF-7A, GF-6A, GF-5 and earlier; GM 4718M and 6094M; Chrysler MS-6395; Ford WSS-M2C205-A. It is compatible with conventional and other synthetic motor oils, though mixing will reduce the performance benefits and shorten the oil's service life. Aftermarket oil additives are not recommended.

SERVICE LIFE
Normal service: up to 12,000 miles or one year, whichever comes first, in personal vehicles not operating under severe service conditions. For severe service, follow the manufacturer's recommended severe-service drain interval listed in your owner's manual.