Home › Forum › Ask A Member › Simple test for oil quality on bushing engines › Re: Simple test for oil quality on bushing engines
If I remember what I learned from my engineer mentor, that is a test for co-efficient of friction. But that’s as much as I know on that subject. Anyhoo, to bear the NMMA logo and TC-W3 certification, an oil must pass the NMMA test. It doesn’t matter what the oil is made of, it can be made of cow flops if it passes the test. Having said that, I’ll bet a 10 spot that you won’t find any 30 or 40 weight straight oil with the logo.
Look at an old Evinrude factory service manual and note that part of a "Tune-Up" was removing the cylinder head and scraping the carbon out (if it had a head). Today’s TC-W3 oils are far superior in that respect. Of course, unleaded gas helps too. But not venturing into the Ethanol subject.
Also, my own personal observation over the years is that if a motor has been subjected to severe overheating, it’s chances of survival are much greater if it was running on synthetic TC-W3 when it happened.
Just my opinion, which together with $1.95 + tax will buy a cup of coffee at the corner gas station.