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.


2024 TC-W3® Registered Two-Stroke-Cycle Marine Oils

Number Name Company
RL-00405J Starbrite Super Premium TCW3 KINPAK, INC.
RL-00406J Starbrite Premium TCW3 KINPAK, INC.
RL-00408J ADNOC Outboard Super Engine Oil Adnoc Distribution
RL-00410J West Marine Premium 2-Cycle Outboard Oil TC-W3 West Marine
RL-00412J West Marine DFI TCW3 West Marine
RL-00415J Mystik Marine Prem 2T OBMO Citgo Petroleum Corporation
RL-00416J Mystik JT-4 Synthetic Blend 2-Cycle Premium Plus Outboard Motor Oil Citgo Petroleum Corporation
RL-00419J Marine Outboard Two Stroke Oil Penrite Oil Company Pty Ltd
RL-00421J Regatta Petron Corporation
RL-00427K Mobil Outboard Plus ExxonMobil Fuels and Lubricants Co.
RL-00441K Evinrude Johnson 2 Cycle Outboard Oil Bombardier Recreational Products, Inc.
RL-00444K Nautilus Premium Outboard Oil Pennzoil-Quaker State Company
RL-00447K Lucas Land & Sea Lucas Oil Products, Inc.
RL-00451L Johnson Evinrude 2 cycle outboard oil Super Premium Bombardier Recreational Products, Inc.
RL-00467M Mercury Racing 2-Stroke Mercury Marine
RL-01371R Phillips 66 Injex 2-Cycle TC-W3 Motor Oil Phillips 66 Company
RL-013888X XPS Marine Outboard Premium Mineral Bombardier Recreational Products, Inc.
RL-035494Y WOLF OUTBOARD 2 STROKE TC-W3 DFI Wolf Oil Corporation N.V.
RL-058086Z MOL Outboard 2T MOL-LUB Ltd.
RL-074743Y Sinclair Highline Warren LLC
RL-098359A NEPTUNA 2T SUPER SPORT TotalEnergies Lubrifiants
RL-111104Z Fram Amalie Oil Company
RL-13116U Castrol Super Outboard Plus Lubricants UK Ltd Technology Center
RL-13121P Sonic Dynamix Plus Federated Co-operatives Ltd.
RL-13125P Lucas Synthetic Blend 2-Cycle Marine Oil Lucas Oil Products, Inc.
RL-13127R Mystik JT-4 Synthetic Blend 2-Cycle All-in-One Citgo Petroleum Corporation
RL-13129R Kendall 2T Marine 2-Cycle Motor Oil Phillips 66 Company
RL-13135T Phillips 66 Unimix 2 Cycle Motor Oil Phillips 66 Company
RL-13136U SuperSyn Outboard 2-Cycle Marine Oil Smitty's Supply Inc.
RL-13139U Pennzoil Premium Outboard and Multipurpose 2-Cycle Oil Pennzoil-Quaker State Company
RL-13216U Super S Premium Outboard Oil Smitty's Supply Inc.
RL-13464U Shell Advance Premium Pennzoil-Quaker State Company
RL-13776U Bardahl Nautico 2T TC-W3 BARDAHL DE MEXICO S. DE R.L 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-13880W S-OIL Outboard 2T TC-W3 S-Oil Corporation
RL-13889W Chronus Outboard Water Cooled 2-Cycle Motor Oil Novergy Chemicals Corp
RL-13894W April 2 cycle engine oil Verco International
RL-13899W Motul Outboard 2T MOTUL SA
RL-13904W CEPSA Outboard 2T CEPSA Comercial Petroleo, S.A.
RL-139333Y Ridgeline Highline Warren LLC
RL-13937W Wolf Outboard 2T TC-W3 Wolf Oil Corporation N.V.
RL-14116U CAM2 Blue Blood 2-Cycle Marine 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-14354X ADDINOL Aquapower Outboard 2T ADDINOL Lube Oil GmbH
RL-14361X Lubrex Marine 2T Plus LUBREX FZC
RL-14651X XPS Marine XD-50 Synthetic Bombardier Recreational Products, Inc.
RL-154197B Repsol SAILOR Outboard & Jet Ski 2T Repsol Lubricantes Y Especialidades S.A.
RL-183991Z Coastal 2-Cycle Engine Oil TC-W3 Warren Oil Company
RL-190497C Nautic Plus 2T Comercial Roshfrans, S.A. de C.V.
RL-213978Z Circle K Pinnacle Oil Holdings, LLC
RL-233246Z National TC-W3 Pinnacle Oil Holdings, LLC
RL-27039K Sierra Premium 2-Cycle Oil Sierra International
RL-29060L Ultra Superstream OBMO Trinidad & Tobago National Petroleum Marketing Company Limited / NP House
RL-29067P Castrol Outboard 2T Lubricants UK Ltd Technology Center
RL-29152R SPC Outboard 2T Super Singapore Petroleum Company Limited
RL-30103K Lubrax Nautica Gasolina 2T / Petrobras Vibra Energia S.A.
RL-327442A Propel Highline Warren LLC
RL-331679Y Outboard Two Stroke Marine TC-W3 Gulf Western Premium Quality Lubricating Oils Pty Ltd
RL-33301R LUBECO 2T Outboard Oil Biona Jersin, s.r.o.
RL-34644U Nautilus Premium Outboard Pennzoil-Quaker State Company
RL-363729A Yamalube 2M Yamaha Motor Corporation
RL-372583A Quicksilver Premium TC-W3 Mercury Marine
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-38000W Motul Outboard Tech 2T MOTUL SA
RL-38117W Biomarine Outboard Two Stroke Oil Penrite Oil Company Pty Ltd
RL-38293W Liqui Moly Marine 2T Motor Oil Liqui Moly GmbH
RL-386620C AIMALUBE Sanho Manufacturing & Packaging Sdn Bhd
RL-400741A Mercury Premium TC-W3 Mercury Marine
RL-405015A Havoline Outboard 2T Chevron Global Lubricants
RL-414211Y Bass Pro Shops 2-Stroke Marine Engine Oil Amalie Oil Company
RL-417681B Nulon 2 Stroke Marine Outboard Oil FUCHS SE
RL-43512X Suzuki Marine 2T MOTUL SA
RL-437634Z HS X3M Amalie Oil Company
RL-459295Z Itasca 2-Cycle Engine Oil TC-W3 Warren Oil Company
RL-474986A Nautilus Premium Outboard Oil Shell UK Oil Products Limited
RL-494688X Sintmare 2T Rilub S.p.A.
RL-499820A Castrol Super Outboard Lubricants UK Ltd Technology Center
RL-508655C MotorMaster 2-Cycle Outboard Engine Oil Irving Oil Limited dba Irving Blending & Packaging
RL-511652A NEPTUNA 2T SUPER SPORT TotalEnergies Lubrifiants
RL-513150C Lubrimatic Highline Warren LLC
RL-57170L Titan Marine TC-W 3 FUCHS SE
RL-697232A Havoline Two Cycle Engine Oil Chevron Global Lubricants
RL-707675A Havoline Two Cycle Engine Oil Chevron Global Lubricants
RL-713733X XPS Marine Outboard Synthetic Blend Bombardier Recreational Products, Inc.
RL-713981X XPS Marine XD-30 Premium Formula Bombardier Recreational Products, Inc.
RL-740361A LUBRAL M2T-WTR Lubricantes de America S.A. de C.V.
RL-776876X Ipiranga Marina 2T Plus Iconic Lubrificantes S.A.
RL-779423Z Fire Star Premium TC-W3 Pinnacle Oil Holdings, LLC
RL-780764A Castrol Outboard 2T Lubricants UK Ltd Technology Center
RL-790144A NEPTUNA 2T BIO-JET TotalEnergies Lubrifiants
RL-80561W Terpel TC-W3 Omni Specialty Packaging
RL-837822A Harvest King Premium 2-Cycle Outboard Engine Oil Citgo Petroleum Corporation
RL-859783A NEPTUNA 2T SUPER SPORT TotalEnergies Lubrifiants
RL-867211A YAMALUBE 2T Eduardono S.A.S.
RL-90042R IGOL Prosurf Aquasynth 2T TC-W3 IGOL France
RL-912225A NEPTUNA 2T SUPER SPORT TotalEnergies Lubrifiants
RL-920413B Castrol Super Outboard Plus Lubricants UK Ltd Technology Center
RL-92340L Castrol Outboard 2T Lubricants UK Ltd Technology Center
RL-923623Z Smartoil Nautique Smartoil de Guatemala, S.A.
RL-92940K Sierra Direct Injection Sierra International
RL-93015J MAG 1 Highline Warren LLC
RL-93016J Super Tech Highline Warren LLC
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-93054T Castrol Super Outboard Plus Lubricants UK Ltd Technology Center
RL-93070R UNO Lubricants Impulse Outboard Motor Oil Highline Warren LLC
RL-93100P Klondike 2-Cycle Engine Oil Klondike Lubricants Corp
RL-93110R Starfire Premium 2-Cycle Engine Oil Coolants Plus Inc.
RL-935369A Mercury Premium Plus TCW3 Mercury Marine
RL-941799Z Starbrite Star Tron TC-W3 KINPAK, INC.
RL-963024A Castrol Outboard 2T Lubricants UK Ltd Technology Center
RL-965735A Quicksilver Premium Plus TCW3 Mercury Marine
RL-96660T PUMA 2T Outboard TCW3 Puma Energy Supply & Trading PTE LTD (Panama Branch)
RL-96661T Raloy Dos Tiempos TC-W3 (Outboard 2T) Raloy Lubricantes, S.A. de C.V.
RL-99050M Syngard Premium Outboard TC-W3 Engine Oil Martin Lubricants; Div. of Martin Operating Partnership L.P.
RL-99465T Max Outboard PTT Oil and Retail Business Public Company Limited
RL-99990T Yamalube 2M Yamaha Motor Distribution Latin America Inc.
RL00151F Xcel Outboard & 2-Cycle Oil Amalie Oil Company
RL01763K PETRONAS OUTBOARD SPECIAL Petronas Lubricants Italy S.p.A.
RL05012F Amalie Pro Two-Cycle TC-W3 Amalie Oil Company
RL27003G Pennsoil Marine Premium Plus Pennzoil-Quaker State Company
RL27004G Pennzoil Marine XLF Pennzoil-Quaker State Company
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
RL32100 Valvoline Multi-Purpose 2-Cycle Engine Oil Valvoline Inc.
RL32257 Unil Opal Outboard TCW3 UNIL OPAL SAS
RL34000 Valvoline Outboard 2-Cycle Marine Oil Valvoline Inc.
RL34001C Sunoco 2-Cycle Engine Oil Valvoline Inc.
RL40462F Irving 2 Cycle + Irving Oil Limited dba Irving Blending & Packaging
RL50391 IGOL Prosurf TC-W3 IGOL France
RL90000G Ravenol Outboardoel 2T Mineral Ravensberger Schmierstoffvertrieb GmbH
RL90001G Ravenol Outboardoel 2T Fullsynth Ravensberger Schmierstoffvertrieb GmbH
RL90044D Yacco Outboard 1000 2T YACCO
RL92010J Resolute 2-Cycle TC-W3 Citgo Petroleum Corporation
RL92019J Supergard Marine Plus Citgo Petroleum Corporation
RL92334D Havoline Two-Cycle Engine Oil TC-W3 Chevron Global Lubricants
RL92402B MP3 Ultra Rock Oil Company
RL93101 Klotz TC-W3 Klotz Synthetic Lubricants, Inc.
RL95102C Tohatsu Premium Outboard Oil Tohatsu America Corp.

For more information regarding oil certification, contact:

Scott Berry
Senior Director, Engineering Standards