Bluestream....I think you are confusing an FC-W spec certified oil with the FC-W (Cat) certified oil.
Here is how they differ:
National Marine Manufacturers Association approved a new catalyst-friendly four-stroke cycle marine engine oil specification that focuses on limiting catalyst poisoning. This specification, indicated by an FC-W Catalyst Compatible® designation, was introduced into the marketplace in 2009.
The four-stroke catalyst compatible specification puts some additional ranges and limits on the additives in the oil, compared to the FC-W® oil specification.
In addition, there are five different limits in chemical or test requirements in the catalyst version of the specification versus the basic FC-W® requirement. The FC-W Catalyst Compatible® oil specification has a limit on phosphorus, while there is no limit under the basic FC-W® specification. The FC-W Catalyst Compatible® specification also adds a limit for silicon, while there is no limit for the standard FC-W®. The FC-W Catalyst Compatible® specification also adds a "stay-in-grade" requirement per SAE J300, while no stay-in-grade requirement exists for the former. Also, a Noack volatility requirement is a requirement of the FC-W Catalyst Compatible® oil specification while there is no limit to the FC-W® specification. Finally, while there also is no wear requirement for the standard FC-W® oil specification, a Sequence IVA wear requirement exists for the FC-W Catalyst Compatible® specification.
My desired oil certification is the standard FC-W. If you do a little more research on the same site, you can see the differences and why I chose this specific certification in a specifically designed marine grade oil. You may not agree with my choose (which is fine of course) but I just wanted to make sure you understood the reasoning I have and the difference between an FC-W vs. a FC-W (Cat) certification. Both certifications coexist and each one has it's own product list.
Here is how they differ:
National Marine Manufacturers Association approved a new catalyst-friendly four-stroke cycle marine engine oil specification that focuses on limiting catalyst poisoning. This specification, indicated by an FC-W Catalyst Compatible® designation, was introduced into the marketplace in 2009.
The four-stroke catalyst compatible specification puts some additional ranges and limits on the additives in the oil, compared to the FC-W® oil specification.
In addition, there are five different limits in chemical or test requirements in the catalyst version of the specification versus the basic FC-W® requirement. The FC-W Catalyst Compatible® oil specification has a limit on phosphorus, while there is no limit under the basic FC-W® specification. The FC-W Catalyst Compatible® specification also adds a limit for silicon, while there is no limit for the standard FC-W®. The FC-W Catalyst Compatible® specification also adds a "stay-in-grade" requirement per SAE J300, while no stay-in-grade requirement exists for the former. Also, a Noack volatility requirement is a requirement of the FC-W Catalyst Compatible® oil specification while there is no limit to the FC-W® specification. Finally, while there also is no wear requirement for the standard FC-W® oil specification, a Sequence IVA wear requirement exists for the FC-W Catalyst Compatible® specification.
My desired oil certification is the standard FC-W. If you do a little more research on the same site, you can see the differences and why I chose this specific certification in a specifically designed marine grade oil. You may not agree with my choose (which is fine of course) but I just wanted to make sure you understood the reasoning I have and the difference between an FC-W vs. a FC-W (Cat) certification. Both certifications coexist and each one has it's own product list.
Last edited: