Protects against gear and bearing wear
Delivers smooth shifts
Helps eliminate loud thunks and gear noise

Advanced protection against wear
Controls thermal runaway
Protects against rust and corrosion
Helps reduce operating temperatures
Long oil, seal & equipment life
Contains friction modifiers for limited-slip applications

Advanced protection against wear
Controls thermal runaway
Protects against rust and corrosion
Helps reduce operating temperatures
Long oil, seal & equipment life
Contains friction modifiers for limited-slip applications

Your engine’s top-end is sparsely lubricated and prone to the development of performance-robbing deposits. It’s also highly susceptible to corrosion, an issue compounded by the prevalence of ethanol in today’s fuel. AMSOIL Upper Cylinder Lubricant is designed to solve those issues. Its AMSOIL-exclusive, powerful formulation helps maximize engine power and performance while increasing engine life. And unlike competing fuel additives, AMSOIL Upper Cylinder Lubricant works.

37% more cleaning power1 to help keep your engine running smoother, longer.
Protects against LSPI
20,000 miles of guaranteed protection between changes2
1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

Outstanding extreme-pressure protection
Delivers 6X more wear protection1
Maintains proper viscosity (thickness)
Minimizes oil consumption
Maximizes fuel efficiency
Excels in extreme temperatures
Confidently extend drain intervals

Fully formulated: DOES NOT require the use of supplemental antifreeze/coolant additives (SCAs) or extenders
Protection up to 1,000,000 miles, 20,000 hours or 8 years, whichever comes first
Ethylene glycol 50/50 pre-mix formulation
Proprietary hybrid organic acid technology (HOAT) formulation is further enhanced with anti-scalant, anti-fouling and water-pump lubrication additives
Phosphate-, nitrite-, silicate-, borate- and amine-free
Compatible with all other antifreeze and coolant colors

Provides effective heat transfer and enhanced corrosion protection
Reduces engine temps up to 25°F (13.8°C)
Helps vehicles warm up an average of 54% faster

37% more cleaning power1 to help keep your engine running smoother, longer.
Protects against LSPI
20,000 miles of guaranteed protection between changes2
1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

37% more cleaning power1 to help keep your engine running smoother, longer.
Protects against LSPI
20,000 miles of guaranteed protection between changes2
1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

37% more cleaning power1 to help keep your engine running smoother, longer.
Protects against LSPI
20,000 miles of guaranteed protection between changes2
1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

37% more cleaning power1 to help keep your engine running smoother, longer.
Protects against LSPI
20,000 miles of guaranteed protection between changes2
1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

37% more cleaning power1 to help keep your engine running smoother, longer.
Protects against LSPI
20,000 miles of guaranteed protection between changes2
1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

75% more engine protection against horsepower loss and wear.1
50% more cleaning power vs. AMSOIL OE Motor Oil
Protects turbochargers 72% better than required2 by the GM dexos1 Gen 2 specification.
28% more acid-neutralizing power than Mobil 1.3
Trusted by professional engine builders
Guaranteed protection for up to 25,000 miles or 1 year
1Based on independent testing of AMSOIL Signature Series 0W-20 using the ASTM D6891 standard test.
2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3Based upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased in July 2020.

75% more engine protection against horsepower loss and wear.1
50% more cleaning power vs. AMSOIL OE Motor Oil
Protects turbochargers 72% better than required2 by the GM dexos1 Gen 2 specification.
28% more acid-neutralizing power than Mobil 1.3
Trusted by professional engine builders
Guaranteed protection for up to 25,000 miles or 1 year
1Based on independent testing of AMSOIL Signature Series 0W-20 using the ASTM D6891 standard test.
2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3Based upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased in July 2020.

75% more engine protection against horsepower loss and wear.1
50% more cleaning power vs. AMSOIL OE Motor Oil
Protects turbochargers 72% better than required2 by the GM dexos1 Gen 2 specification.
28% more acid-neutralizing power than Mobil 1.3
Trusted by professional engine builders
Guaranteed protection for up to 25,000 miles or 1 year
1Based on independent testing of AMSOIL Signature Series 0W-20 using the ASTM D6891 standard test.
2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3Based upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased in July 2020.

Outstanding protection for smaller American diesel pickups, vans, cars and SUVs
Delivers up to 6X more wear protection than required by a leading industry standard1
Retains viscosity for added engine protection and increased fuel economy
Excels in hot and cold temperature extremes
Minimizes oil consumption
1based on third-party testing in the OM646LA cam wear test using 0W-20 as worst-case representation