The design of marine gasoline engines, both two-stroke and four-stroke, has evolved significantly, resulting in higher-output engines that place increased demands on engine lubricants. At the same time, growing environmental concerns have led to leaner fuel/oil ratios, further intensifying lubricant performance requirements. To help boaters identify lubricants that support the durability and performance intended by marine engine manufacturers, the National Marine Manufacturers Association (NMMA) has established a comprehensive Marine Oil Certification Program. This program ensures that only premium-quality lubricants meeting stringent performance standards are certified for use in marine engines.
The NMMA Marine Oil Certification Program is comprised of two key components:
- Certification of oil additive packages - ensuring the formulation meets NMMA's rigorous testing standards.
- Annual registration of oil brands - allowing manufacturers to register oils that incorporate certified additives and meet the required performance criteria.
All NMMA-registered marine oils are listed on the NMMA website. These oils are identified by the following certification symbols:
- TC-W3® - for oils formulated specifically for two-stroke marine engines.
- FC-W® - for oils designed for use in four-stroke marine engines.
- FC-W(CAT)® - for oils compatible with four-stroke marine engines equipped with exhaust after-treatment catalysts.
This certification system helps ensure that boaters are using lubricants that protect engine longevity and comply with environmental standards.
For more information regarding oil certification, contact:
Scott Berry
Vice President, Engineering Standards
312.946.6254