Due to the nature of two-stroke marine engines, two-stroke oil lubricates the engine parts as it passes through the engine and is then burned along with the fuel. Two-stroke oil is either physically mixed with the fuel or, in the case of direct fuel injection, is combined with the fuel in the combustion chamber. This is in contrast to four-stroke engines which have oil sumps circulate the oil by pumping it throughout the engines.

The long-term objectives of the two-stroke engine industry have been to reduce emissions which contain burned and unburned oil that have passed through the engine, and to develop a quality of oil that reduces the mixture ratio to fuel while extending the life of the engine. That means significantly reduced emissions to satisfy EPA requirements, less warranty problems, and increased customer satisfaction due to engines lasting longer with less maintenance and overhauls.

TC-W3® lubricant, an NMMA-owned trademark, has evolved over the years through much testing and research, and has proven to be the level of quality needed to satisfy the above objectives. And, going a step further, now that two-stroke engines have moved towards higher cylinder temperatures and compressions, this type of lubricant also helps to meet the EPA emissions reductions.

TC-W3® oils have demonstrated the necessary lubrication performance quality needed for these more demanding cylinder/engine conditions.

The TC-W3® oil standard is a performance-based qualification program. The requirements include various bench tests for fluidity, miscibility, rust, compatibility, etc., as well as engine tests to evaluate the prevention of ring sticking and carbon buildup on pistons and other engine parts. The engine tests include one Johnson 40 hp and two consecutive Mercury 15 hp tests, all of which are run under severe conditions for 100 hours each. Two additional engine tests are also conducted to ensure a high level of lubricity performance. The testing process is comprehensive and expensive, but worth the outcome for consumers and manufacturers.

Once lubricants have demonstrated the necessary lubrication performance qualities needed for TC-W3® certification testing by NMMA-approved laboratories, NMMA licenses those two-stroke lubricants to be marketed to the public. TC-W3® oils are licensed around the world and are recommended for use by two-stroke engine manufacturers.


2020 TC-W3® Registered Two-Stroke-Cycle Marine Oils

Number Name Company
RL-00400R Gulf Pride 3000 Gulf Oil International
RL-00405J Starbrite Super Premium TCW3 KINPAK, INC.
RL-00406J Starbrite Premium TCW3 KINPAK, INC.
RL-00419J Marine Outboard Two Stroke Oil Penrite Oil Company Pty Ltd
RL-00420J Super Outboard 3 Chevron Singapore Pte Ltd.
RL-11180T Nautic Plus 2T Comercial Roshfrans, S.A. de C.V.
RL-13027T Havoline Outboard 2T Chevron Belgium NV
RL-13136U SuperSyn Outboard 2-Cycle Marine Oil Smitty's Supply Inc.
RL-13216U Super S Premium Outboard Oil Smitty's Supply Inc.
RL-13758U Ace Outboard Engine Oil Warren Distribution
RL-13776U Bardahl Nautico 2T TC-W3 Bardahl de Mexico S. A. de C. V.
RL-13778U INA Outboard Plus INA MAZIVA, Ltd
RL-13818U Marine 2 Temps TCWIII Minerva Oil SAS
RL-13837W Champion Outboard 2T TC-W3 Champion Chemicals N.V.
RL-13872W National TC-W3 Pinnacle Oil Holdings, LLC
RL-13880W S-OIL Outboard 2T TC-W3 S-Oil Corporation
RL-13882W Marathon Marine-Terrain TC-W3 Pinnacle Oil Holdings, LLC
RL-13889W Chronus Outboard Water Cooled 2-Cycle Motor Oil Novergy Chemicals Corp
RL-139333Y Ridgeline Warren Distribution
RL-13937W Wolf Outboard 2T TC-W3 Wolf Oil Corporation N.V.
RL-14116U CAM2 Blue Blood 2-Cycle Motor Oil Smitty's Supply Inc.
RL-14306W Marine Performance 2M Oil Yamaha Motor Canada Ltd.
RL-14351X Galp Oceanus PETROGAL S.A. - Galp Energia
RL-29152R SPC Outboard 2T Super Singapore Petroleum Company Limited
RL-30068L Raloy Dos Tiempos TCW-3 (Outboard 2T) Raloy Lubricantes, S.A. de C.V.
RL-30103K Lubrax Nautica Gasolina 2T / Petrobras Petrobas Distribuidora S.A.
RL-31162U Delta Outboard Motor Oil Warren Distribution
RL-33301R LUBECO 2T Outboard Oil Biona Jersin, s.r.o.
RL-37590U KPO Jet Ski Watecraft 2-Stroke Oil Kawasaki Motors Corp., U.S.A.
RL-37761U Liqui Moly Marine 2T DFI Motor Oil Liqui Moly GmbH
RL-37991W TruOil Synthetic Calumet Branded Products, LLC
RL-38117W Biomarine Outboard Two Stroke Oil Penrite Oil Company Pty Ltd
RL-38293W Liqui Moly Marine 2T Motor Oil Liqui Moly GmbH
RL-38723W Speedway TC-W3 Pinnacle Oil Holdings, LLC
RL-38725W Fire Star Premium TC-W3 Pinnacle Oil Holdings, LLC
RL-494688X Sintmare 2T Rilub S.p.A.
RL-57170L Titan Marine TC-W 3 Fuchs Petrolub SE
RL-646188X Havoline Two-Cycle Engine Oil TC-W3 Iconic Lubrificantes S.A.
RL-772313Y Casey's Drive Professional Series Outboard Engine Oil Pinnacle Oil Holdings, LLC
RL-776876X Ipiranga Marina 2T Plus Iconic Lubrificantes S.A.
RL-80561W Terpel TC-W3 Omni Specialty Packaging
RL-93015J MAG 1 Warren Distribution
RL-93016J Super Tech Warren Distribution
RL-93050R Master Pro TC-W3 Omni Specialty Packaging
RL-93051R Pure Guard TC-W3 Omni Specialty Packaging
RL-93052R Xtra-Rev TC-W3 Omni Specialty Packaging
RL-93070R UNO Lubricants Impulse Outboard Motor Oil Warren Distribution
RL-93110R Starfire Premium 2-Cycle Engine Oil Coolants Plus Inc.
RL-96661T Raloy Dos Tiempos TC-W3 (Outboard 2T) Raloy Lubricantes, S.A. de C.V.
RL-98501K EKOIL 2T Aqua Premium EKOIL Ltd.
RL-99050M Syngard TC-W3 Engine Oil Martin Lubricants; Div. of Martin Operating Partnership L.P.
RL-99340T Gulf Pride 3000 Gulf Oil International
RL-99460M Yamalube 2M TC-W3 Yamaha Motor Argentina S.A.
RL-99465T Max Outboard PTT Oil and Retail Business Public Company Limited
RL-99670T Top 1 Evolution 2-Cycle TC-W3 AOCUSA
RL-99990T Yamalube 2M Yamaha Motor Distribution Latin America Inc.
RL00197G Synthe Nautic Armorine SAS
RL29018F RAVENOL Outboardoel 2T Teilsynth Ravensberger Schmierstoffvertrieb GmbH
RL29019G Ravenol Watercraft Fullsynth. 2-Takt Ravensberger Schmierstoffvertrieb GmbH
RL29901H Ravenol Watercraft Mineral 2-Takt Ravensberger Schmierstoffvertrieb GmbH
RL30010H Ravenol Watercraft Teilsynth 2-Takt Ravensberger Schmierstoffvertrieb GmbH
RL32257 Unil Opal Outboard TCW3 UNIL OPAL SAS
RL51030 Q8 Outboard Kuwait Petroleum Research & Technology
RL56669E Valvoline Super Outboard 2T Ellis Enterprises B.V.
RL60104F Itasca 2-Cycle Engine Oil TC-W3 Warren Oil Company
RL70172F Coastal TC-W3 2-Cycle Engine Oil Warren Oil Company
RL82008K Gulf Green 3000 Gulf Oil International
RL90000G Ravenol Outboardoel 2T Mineral Ravensberger Schmierstoffvertrieb GmbH
RL90001G Ravenol Outboardoel 2T Fullsynth Ravensberger Schmierstoffvertrieb GmbH
RL90044D Yacco Outboard 1000 2T YACCO
RL92402B MP3 Ultra Rock Oil Company
RL92805 JET SPEED 2T Bucher AG Langenthal- Motorex Schmiertechnik
RL93002J Super Outboard 3 Chevron Singapore Pte Ltd.
RL93101 Klotz TC-W3 Klotz Synthetic Lubricants, Inc.
RL93340 OCEAN FS 2T BIO Bucher AG Langenthal- Motorex Schmiertechnik
RL95102C Tohatsu Premium Outboard Oil Tohatsu America Corp.
RL99309K YAMALUBE 2M Yamaha Motor Corporation

For more information regarding oil certification, contact:

Scott Berry
Director of Engineering Standards