Re: TC-W3 question

[frankr]

NMMA is the recognized testing authority. If an oil mfr wants their oil certified, they must submit it to NMMA for testing in actual outboard motors which are then torn down and inspected for wear and carbon , etc. If it passes, that mfr earned the right to mark it as such and put the NMMA logo on the container. The gotcha is the stuff with double-talk like "meets or exceeds TC-W3" or something of that nature. If it does not have the NMMA logo, either it has flunked the test or wasn’t even submitted for testing.

Note that TC-W3 designation does not specify what’s in the oil. Only that it passed the test.