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.


2022 TC-W3® Registered Two-Stroke-Cycle Marine Oils

Number Name Company
RL-01371R Phillips 66 Injex 2-Cycle TC-W3 Motor Oil Phillips 66 Company
RL-035494Y WOLF OUTBOARD 2 STROKE TC-W3 DFI Wolf Oil Corporation N.V.
RL-13121P Sonic Dynamix Plus Federated Co-operatives Ltd.
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-13818U Marine 2 Temps TCWIII Minerva Oil SAS
RL-13837W Champion Outboard 2T TC-W3 Champion Chemicals N.V.
RL-13937W Wolf Outboard 2T TC-W3 Wolf Oil Corporation N.V.
RL-14354X ADDINOL Aquapower Outboard 2T ADDINOL Lube Oil GmbH
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-37590U KPO Jet Ski Watecraft 2-Stroke Oil Kawasaki Motors Corp., U.S.A.
RL-37991W TruOil Synthetic Calumet Branded Products, LLC
RL-43545X ADDINOL Aquapower Outboard 2T S ADDINOL Lube Oil GmbH
RL-57170L Titan Marine TC-W 3 Fuchs Petrolub SE
RL-80561W Terpel TC-W3 Omni Specialty Packaging
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-99060T Havoline 2-Cycle Engine Oil TC-W3 Lubrication Technologies, Inc. - Lube-Tech
RL-99460M Yamalube 2M TC-W3 Yamaha Motor Argentina S.A.
RL00197G Synthe Nautic Armorine SAS
RL10140 Avia Outboard Thevenin Ducrot Lubrifiants

For more information regarding oil certification, contact:

Scott Berry
Director of Engineering Standards