Historically, gasoline-powered inboard and inboard/outboard (sterndrive) boats have been equipped with four-stroke cycle engines. With growing interest and legislation in reducing marine engine emissions, these four-stroke cycle engines are now appearing with exhaust after-treatment. In recognition of emerging four-stroke cycle engines with catalysts in the marine market and their unique lubrication demands, the NMMA Oil Certification Committee initiated the development of a new four-stroke cycle engine oil specification, “NMMA FC-W Catalyst Compatible®.”
The need to protect the catalysts adds another dimension to the lubrication demands of marine engines whose duty cycles have always discriminated them from over-the-road light and heavy duty automotive engines. High loads, high speeds, and exposure to high levels of humidity and salt water are just a few of the unique characteristics found in the marine environment.
This new catalyst-compatible standard draws heavily on the experience and success of the earlier NMMA FC-W® standard, which was developed to meet the needs of large and technically advanced four-stroke cycle marine engines. These include four-stroke cycle outboard engines, which are now taking the place of some conventional two-stroke cycle outboard engines. As a result, the new catalyst-compatible standard can provide the performance required for engines that would otherwise call for NMMA FC-W® lubricants.
This new catalyst-compatible specification follows the longstanding and successful tradition of BIA TC-W, NMMA TC-WII®, NMMA TC-W3®, and NMMA FC-W® programs to assist boaters and manufacturers in identifying the proper engine oils which have been specially formulated to withstand the rigors of use in marine engines. The NMMA FC-W Catalyst Compatible® specification is intended to support the industry in providing long term durability, power and overall consumer satisfaction with marine engines utilizing catalyst after-treatment.
2025 FC-W (CAT)® Marine Oils
| Number | Name | Company |
|---|---|---|
| FC-01750T | Pro Star 4 Stroke 25W40 Outboard Oil | KINPAK, INC. |
| FC-01810T | Pro Star 4 Stroke 10W40 Outboard Oil | KINPAK, INC. |
| FC-01820T | Pro Star 4 Stroke 10W30 Outboard Oil | KINPAK, INC. |
| FC-105159D | Synergy Synthetic Marine ExP 10W-40 | Northland Products Company |
| FC-11298X | Ravenol Outboardoel 4T SAE 10W-40 | Ravensberger Schmierstoffvertrieb GmbH |
| FC-118905Z | Starbrite Star Tron 25W40 | KINPAK, INC. |
| FC-162395Z | Starbrite Star Tron 10W30 | KINPAK, INC. |
| FC-251582D | Synergy Synthetic Marine ExP 25W-40 | Northland Products Company |
| FC-350367Z | LIQUI MOLY Marine 4T Motor Oil 10W-30 | Liqui Moly GmbH |
| FC-427822C | Starbrite Star Tron 10W40 | KINPAK, INC. |
| FC-43514X | Ravenol Marine Oil Petrol SAE 25W-40 | Ravensberger Schmierstoffvertrieb GmbH |
| FC-43517X | Ravenol Outboardoel 4T SAE 25W-40 | Ravensberger Schmierstoffvertrieb GmbH |
| FC-481526D | Synergy Synthetic Marine ExP 10W-30 | Northland Products Company |
| FC-51534X | Ravenol Outboardoel 4T SAE 10W-30 | Ravensberger Schmierstoffvertrieb GmbH |
| FC-738288Z | LIQUI MOLY Marine 4T Motor Oil 25W-40 | Liqui Moly GmbH |
| FC-783006Z | LIQUI MOLY Marine 4T Motor Oil 25W-50 | Liqui Moly GmbH |
For more information regarding oil certification, contact:
Scott Berry
Senior Director, Engineering Standards
312.946.6254