Person holding a large, beige bottle with measurement markings, in a store aisle lined with similar bottles.

Engineered for Performance and Protection

AMSOIL is a leader in synthetic lubrication solutions, offering products designed to enhance engine performance, reduce wear, and extend service life. With a reputation for quality and innovation, many AMSOIL diesel and motor oils deliver guaranteed protection for up to 25,000 miles, making them a preferred choice for those seeking reliability and efficiency.

AMSOIL Product Lineup

Stay Informed & Updated

Understanding Oil Viscosity Presentation Slide.

Understanding Oil Viscosity

12/11/2025
Viscosity is the measure of a fluid's resistance to flow. The physical properties of lubricants...

Unmatched Protection for Every Drive

AMSOIL’s advanced formulas provide unmatched protection, whether for daily use or high-performance applications. Reach out today to get access to top-tier AMSOIL products. Whether you need AMSOIL transmission fluid or accessories, we are your right choice.

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More AMSOIL® Products

AMSOIL synthetic outboard 2-stroke oil bottle.

AMSOIL 100:1 Pre-Mix 100% Synthetic 2-Stroke Outboard Oil

Performance-Engineered for Outboards• Protects two-stroke outboards at 100:1 mix ratios.• Prevents plug...
Blue bottle of HP Marine injector oil.

AMSOIL HP Marine® 100% Synthetic 2-Stroke Oil

Excellent for Evinrude* E-TEC* factory-lean setting Helps prevent deposits Protects against wear Low smoke...
Blue bottle of marine engine oil.

AMSOIL 25W-40 Synthetic-Blend Marine Engine Oil

Excellent high-stress, high-rpm endurance Increased rust and corrosion protection Warning - Click...
Blue bottle of AMSOIL marine engine oil.

AMSOIL 10W-40 100% Synthetic Marine Engine Oil

Excellent high-stress, high-rpm endurance Increased rust and corrosion protection NMMA FC-W Catalyst Compatible...
Blue bottle of synthetic marine engine oil.

AMSOIL 10W-30 100% Synthetic Marine Engine Oil

Excellent high-stress, high-rpm endurance Increased rust and corrosion protection NMMA FC-W Catalyst Compatible...
Synthetic motor oil bottle, AMSOIL, 5W-40.

AMSOIL 5W-40 100% Synthetic ATV/UTV Motor Oil

Protection when performing demanding chores and tackling tough terrain Delivers consistent clutch...
AMSOIL synthetic motor oil bottle, yellow cap.

AMSOIL 5W-50 100% Synthetic ATV/UTV Motor Oil

Protection when performing demanding chores and tackling tough terrain Superior all-weather performance...
Amsoil synthetic motor oil bottle, 10W-40.

AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil

Protection when performing demanding chores and tackling tough terrain Delivers consistent clutch...
Amsoil motor oil bottle, SAE 10W-30.

AMSOIL 10W-30 100% Synthetic ATV/UTV Motor Oil

Protection when performing demanding chores and tackling tough terrain Delivers consistent clutch...
AMSOIL SAE 0W-50 motor oil bottle.

AMSOIL 0W-50 100% Synthetic ATV/UTV Motor Oil

Protection when performing demanding chores and tackling tough terrain Superior all-weather performance...
Amsoil synthetic motor oil bottle.

AMSOIL Formula 4-Stroke® Powersports 0W-40 Synthetic Motor Oil

Specially formulated for four-stroke powersports engines Delivers quick startup protection Helps prevent carbon/varnish...
AMSOIL ATV-UTV Oil Change Kit label.

AMSOIL ATV/UTV Kits For Can-Am® Vehicles

Combine everything needed to perform an AMSOIL oil change on the...
AMSOIL ATV-UTV Oil Change Kit label.

AMSOIL ATV/UTV Kits for Polaris® Vehicles

Combine everything needed to perform an AMSOIL oil change on the...
AMSOIL synthetic 2-stroke oil packet.

AMSOIL SABER® Professional 100% Synthetic 2-Stroke Oil

Excellent lubricity and cleanliness Controls friction and helps prevent wear, plug fouling,...
AMSOIL small engine oil bottle, SAE 10W-30.

AMSOIL 15W-50 100% Synthetic Small Engine Oil

Protects up to 200 hours Helps extend engine life Rust-inhibited Maximizes engine power...
Synthetic small-engine oil bottle, gray packaging.

AMSOIL 10W-40 100% Synthetic Small-Engine Oil

Protects up to 200 hours Helps extend engine life Rust-inhibited Maximizes engine power...
AMSOIL small engine oil bottle.

AMSOIL 5W-30 100% Synthetic Small-Engine Oil

Protects up to 200 hours Helps extend engine life Rust-inhibited Maximizes engine power...
Amsoil small engine oil bottle.

AMSOIL 10W-30 100% Synthetic Small-Engine Oil

Protects up to 200 hours Helps extend engine life Rust-inhibited Maximizes engine power...
Metal hex nut beside measuring ruler.

Adapter Fitting

Fitting, Adapter, 3/4"-16 to 1/4" NPT Product code : BP209-EA BUY...
Rubber gasket with measuring rulers beside.

Gasket,3.45OD,3.11ID,0.26Thk

Gasket for BK302 that is part of BMK23 and BMK27....
Metal elbow pipe fitting with ruler scale.

90 Deg elbow 1/8 NPT X1/4 JIC

Fitting, 90 Degree, 1/8" NPT to 7/16"-20 JIC Product code...