AMSOIL Marine 2-Stroke Oil | HP Marine & 100:1 Pre-Mix Outboard
Marine 2-Stroke Synthetic Oils
AMSOIL offers two synthetic 2-stroke oils engineered for the unique demands of marine outboard, PWC and jet-boat applications. HP Marine is the high-performance choice for modern DFI and EFI motors — proven at the Evinrude E-TEC factory-lean setting — while 100:1 Pre-Mix Outboard Oil is purpose-built for lean 100:1 mix-ratio operation in older or smaller TC-W3 outboards.
Both are NMMA TC-W3 and Warranty Secure.
Choose Your Product
Free shipping on orders $100+ · Shipping & 30-day returns handled by AMSOIL.
Independent AMSOIL Dealer #30576570
HP Marine — DFI and E-TEC Factory-Lean Protection
HP Marine’s exclusive synthetic formulation provides increased lubricity for reduced wear during normal and lean-mix operation.
In field testing on a 40-hp Evinrude E-TEC outboard owned by a northern Minnesota fishing outfitter, HP Marine prevented piston ring sticking and piston scuffing after a full season of rental use at the motor’s factory-lean setting.
Formulated with MAXDOSE, a system of advanced additives for super-clean operation. In field testing, HP Marine prevented ring sticking and ring jacking (carbon buildup behind the ring, forcing it outward) — a phenomenon that occurs in modern DFI outboard motors — and virtually eliminated exhaust port deposits.
Low aquatic toxicity: HP Marine achieved a 100% survival rate in both the OECD Guideline 203 Fish Acute Toxicity Test and the OECD Guideline 202 Daphnia Acute Immobilization Test.
Use: Two-stroke marine applications that specify TC-W3, including Johnson/Evinrude (FICHT, E-TEC), Mercury EFI and Optimax, Yamaha, Nissan, Tohatsu TLDI, Suzuki, Mariner, Force. Injection oil or 50:1 pre-mix (2.6 oz. per U.S. gallon).
100:1 Pre-Mix Outboard Oil — Lean-Ratio, Smokeless
AMSOIL 100:1 Pre-Mix Synthetic 2-Stroke Outboard Oil is engineered with low-temperature dispersants that reduce varnish and carbon deposits to help eliminate plug fouling and promote rapid throttle response in water-cooled outboard motors.
Its environmentally friendly low-smoke, low-odor, low-toxicity properties produce fewer emissions at 100:1 mix ratios than other oils mixed at 50:1. Delivers superior lubricity and anti-wear protection at the lean 100:1 mix ratio, inhibits rust and corrosion, and improves ignition, idling and throttle response.
Use: Pre-mixed in two-stroke outboard motors, personal watercraft and jet boats that specify TC-W3. For maximum performance, mix with gasoline at 100:1 regardless of OEM mix-ratio guidance.
Mix ratios
| Ratio | Oil | Fuel |
|---|---|---|
| 50:1 | 2.6 oz. | 1 gallon |
| 80:1 | 8.0 oz. | 5 gallons |
| 100:1 | 8.0 oz. | 6 gallons |
Order AMSOIL Marine 2-Stroke Oils
Shop Marine 2-Stroke Oils at AMSOIL.com Independent AMSOIL Dealer #30576570
For wholesale pricing, contact Havasu Synthetics about the Preferred Customer program and save up to 25% on all AMSOIL products.
Frequently Asked Questions
Warranty Secure
Both AMSOIL HP Marine and AMSOIL 100:1 Pre-Mix Synthetic 2-Stroke Outboard Oil are Warranty Secure, keeping your factory warranty intact. Each is a high-performance replacement for manufacturer-branded oils and is backed by the AMSOIL Limited Warranty. For complete information visit AMSOIL.com/guarantee.
All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.