AMSOIL HP MARINE® 100% SYNTHETIC 2-STROKE OIL

AMSOIL HP Marine Synthetic 2-Stroke Oil delivers deposit-free, low-smoke protection for modern direct fuel injection outboard motors and conventional 2-stroke marine engines alike. Whether you run it through an oil injection system or mix it at 50:1, this is a purpose-built synthetic formulation designed to handle the demands of today's leaner, hotter-running outboard powerheads.

Modern two-stroke outboard motors burn leaner than their predecessors. Direct fuel injection systems from Evinrude E-TEC, Mercury Optimax, and Yamaha HPDI squeeze more power out of every drop of fuel, but that efficiency comes at a cost. Less oil reaches critical surfaces, and what does get there has to work harder in a hotter combustion environment. Carbon deposits, ring sticking, and piston scuffing become real threats, especially during extended full-throttle runs or all-day trolling in a rental fleet.

PROVEN WEAR PROTECTION IN LEAN-MIX OPERATION
HP Marine's synthetic base oils deliver film strength that holds up where conventional TC-W3 oils break down. In a full-season field test using a 40-hp Evinrude E-TEC outboard set to its factory-lean oil ratio, HP Marine prevented piston ring sticking and piston scuffing entirely. The motor was operated by a northern Minnesota fishing outfitter under rental-fleet conditions, which is about as punishing a duty cycle as a 2-stroke outboard will ever see. The TC-W3 Lubricity Test (ASTM D4863) result confirms the oil's ability to maintain a protective film under boundary lubrication conditions.

MAXDOSE ADDITIVE SYSTEM FOR CLEAN POWERHEADS
Exhaust port deposits restrict flow and rob power. Carbon buildup behind piston rings (ring jacking) forces rings outward and accelerates bore wear. HP Marine is formulated with MAXDOSE, a concentrated additive package that virtually eliminated exhaust port deposits and prevented ring jacking in field testing. For boaters running Mercury Optimax DFI or Evinrude E-TEC engines, this kind of deposit control directly translates to consistent power output and longer intervals between top-end service.

LOW SMOKE AND LOW AQUATIC TOXICITY
The synthetic formulation burns cleaner than petroleum-based TC-W3 oils, producing noticeably less exhaust smoke and odor. HP Marine passes the JASO M 342-92 Smoke Test at the FD level, the highest smoke rating in the JASO classification system. It also achieved a 100% survival rate in both the OECD Guideline 203 Fish Acute Toxicity Test and the OECD Guideline 202 Daphnia Acute Immobilization Test. If you spend your days on freshwater lakes or coastal fisheries, that matters to the water you're floating on.

COLD-WEATHER PERFORMANCE
HP Marine pours at -55°C (-67°F) and records a Brookfield viscosity of 13,696 cP at -40°C. For early-season launches in cold climates or high-altitude lake fishing where morning temperatures hover near freezing, the oil flows freely through injection systems and mixes readily in pre-mix applications without pooling or separation.

SPECIFICATIONS AND COMPATIBILITY
HP Marine meets NMMA TC-W3 certification requirements, including the TC-W3 Rust Test. It is suitable for use in all two-stroke marine applications specifying TC-W3 oil, including engines from Johnson/Evinrude, Mercury EFI and Optimax, Yamaha, Yamaha HPDI, Nissan, Tohatsu TLDI, Suzuki, Mariner, and Force. Compatible with other mineral and synthetic TC-W3 oils, though mixing should be minimized. Use as an injection oil or at a 50:1 pre-mix ratio (2.6 oz. per U.S. gallon of gasoline). HP Marine is Warranty Secure, keeping your factory warranty intact.