Walmart, any generic TCW3 is
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oil.
I was running generics. Walmart, Westmarine, etc. I had horrible water ingestion problems. I started thinking about this blue froth I had on stuff all the time. One of the guys in the group on a B1 had similar problems in the surf. He found a local place that wholesales Merc Quicksilver (fill you 1ga from a 55ga, $20/ga), so he gave it a shot. No more water ingestion issues. I switched, my issues vastly improved (X2 always has ingestion issues).
So, of course, experiment to back up a claim...
Take your
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generic oil. Put about 1" worth in a glass jar. Put the next 5-6" as water (old spagitti jars work good). Shake well. Quicksilver immediately beads up like cooking oil. Generics turn the water blue, froth and take hours to separate. Oil the mixes with water? What the crap?
We have found a place local that sells amzoil for $28/ga wholesale, so I may be switching over to that once I burn through my stockpile of quicksilver, now that I can afford a little better oil.
I'm sure a few of those threads OCD linked have similar info.
Moral of the story, buy the best oil you can afford, but don't buy the cheapest available even if it's all you can afford.