Two-Stroke Engine Lubrication

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

Long-Term Industry Goals

The two-stroke engine industry’s long-term objectives are twofold. The first is to reduce emissions which contain burned and unburned oil that has passed through the engine. The second is to develop a quality of oil that reduces the oil-to-fuel mixture ratio while extending the life of the engine.

Achieving these goals will lead to significantly reduced emissions, meeting EPA requirements. It will also result in fewer warranty problems and greater customer satisfaction as engines will have a longer lifespan, requiring less maintenance and fewer overhauls.

The Role of TC-W3® Lubricant

TC-W3® lubricant, an NMMA-owned trademark, has evolved over the years through extensive testing and research. It has consistently achieved the quality level needed to satisfy the objectives mentioned above. Additionally, as two-stroke engines have advanced and cylinder temperatures and compressions have increased, this lubricant also plays a role in achieving EPA emissions reduction goals.

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

TC-W3® Oil Standard

The TC-W3® oil standard is a performance-based qualification program. The requirements include various bench tests for fluidity, miscibility, rust, compatibility, etc. Additionally, engine tests are used to evaluate the oil’s effectiveness in the prevention of ring sticking and carbon buildup on pistons and other engine components.

The testing process consists of one Johnson 40 hp engine test and two consecutive Mercury 15 hp engine tests. During these tests, each of the engines is run under severe conditions for 100 hours. Two additional engine tests are also conducted to ensure a high level of lubricity performance. Although the testing process is comprehensive and expensive, it is invaluable in delivering a high-quality outcome for consumers and 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-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-00444K Nautilus Premium Outboard Oil Pennzoil-Quaker State Company
RL-00447K Lucas Land & Sea Lucas Oil Products, Inc.
RL-035494Y WOLF OUTBOARD 2 STROKE TC-W3 DFI Wolf Oil Corporation N.V.
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-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-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-13837W Champion Outboard 2T TC-W3 Champion Chemicals N.V.
RL-13889W Chronus Outboard Water Cooled 2-Cycle Motor Oil Novergy Chemicals Corp
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-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-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-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-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-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-414211Y Bass Pro Shops 2-Stroke Marine Engine Oil Amalie Oil Company
RL-417681B Nulon 2 Stroke Marine Outboard Oil FUCHS SE
RL-437634Z HS X3M Amalie Oil Company
RL-459295Z Itasca 2-Cycle Engine Oil TC-W3 Warren Oil Company
RL-494688X Sintmare 2T Rilub S.p.A.
RL-499820A Castrol Super Outboard Lubricants UK Ltd Technology Center
RL-511652A NEPTUNA 2T SUPER SPORT TotalEnergies Lubrifiants
RL-513150C Lubrimatic Highline Warren LLC
RL-57170L Titan Marine TC-W 3 FUCHS SE
RL-740361A LUBRAL M2T-WTR Lubricantes de America S.A. de C.V.
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-837822A Harvest King Premium 2-Cycle Outboard Engine Oil Citgo Petroleum Corporation
RL-859783A NEPTUNA 2T SUPER SPORT TotalEnergies Lubrifiants
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-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-941799Z Starbrite Star Tron TC-W3 KINPAK, INC.
RL-963024A Castrol Outboard 2T Lubricants UK Ltd Technology Center
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
RL92010J Resolute 2-Cycle TC-W3 Citgo Petroleum Corporation
RL92019J Supergard Marine Plus Citgo Petroleum Corporation
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