High-quality motor oil is critical for maximum performance in modern two-cycle marine motors.
Direct fuel injection (DFI) improves combustion efficiency, delivering the extra power enthusiasts
want, while leaner gas-to-oil ratios provide the reduced exhaust emissions the government mandates.
The leaner ratio leaves less oil to lubricate and protect these hotter, more powerful motors, which
invites deposits and wear that threaten engine performance and life. HP Marine is proven to excel
in these harsh challenges. It controls performance-robbing friction, heat and wear, yet produces
low smoke and has low aquatic toxicity properties. It's an oil as advanced as the engines it
Outstanding Wear Protection
The elevated heat and friction of modern two-cycle marine motors can exceed the film strength of
inferior oils, increasing the likelihood of scuffing and wear. HP Marine's exclusive synthetic
formulation provides increased lubricity for reduced wear during normal and lean-mix operation (see
field study results). In 534 hours of field testing, HP Marine completely prevented piston skirt
and cylinder bore scuffing, demonstrating its superior lubricity and ability to reduce friction
between moving parts. It maintains a strong lubricating film even in lean-mix, severe-service
conditions, helping marine engines achieve maximum life.
Excellent Deposit Control
HP Marine is formulated with MAXDOSE™, a system of advanced additives for "super-clean" operation.
It helps prevent deposits that lead to poor performance. In field testing, HP Marine inhibited ring
deposits that can cause ring sticking and ring jacking (carbon build-up behind the ring, forcing it
outward), a phenomenon that occurs in modern DFI outboard motors. It also virtually eliminated
exhaust port deposits for reliable, efficient operation.
Proven in Marine E-TEC Field Study
HP Marine was installed in a 250-hp Evinrude E-TEC engine powering a heavy-duty marine rescue
vessel. Following a 28-hour break-in period at the normal oil setting, the engine was programmed to
its factory-lean setting and operated for 506 hours prior to disassembly. An ASTM calibrated rater
examined and awarded each component either a merit rating on a scale of 0 to 10 (with 10
representing no distress) or a percentage rating (with 0 percent representing no distress). Results
prove HP Marine provided exceptional wear protection and deposit control. For complete study
results, visit amsoil.com/proof.
HP Marine™ is recommended for use in all two-cycle outboard motors including, but not limited to,
Johnson® and Evinrude® FICHT® & E-TEC™ (replaces XD100™ 2-Cycle Oil); Mercury® EFI &
Optimax®; Yamaha®; Nissan® and Tohatsu® TLDI®; Suzuki®; Mariner® and Force®. It is also recommended
for use in all two-cycle personal watercraft (PWC). Use as injection oil or as 50:1 pre-mix (2.6
oz. per U.S. gallon of gas) where NMMA TC-W3 or API TC oils are specified. Compatible with mineral
and synthetic TC-W3-type two-cycle oils; however, mixing two-cycle oils should be minimized.