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We've got a Yamaha 2-stroke 90 and had a bottle of Yamalube that lasted a while.
I hesitantly got a big bottle of Quicksilver in a pinch,
(Although I was prepared to spend twice as much for the Yl)
and poured it in the side oiler.
Looked the same blue consistency...
At the time there was a 25 mile round trip work run,
and I was waiting for the engine to seize up.
It didn't after the first run or the 2nd week.
I've finished my 2nd bottle now,
and am a firm believer in all tcw3 oils are somewhat equal.
The engine only smokes a bit at first start and runs clean even at idle.

I'm so cheap now about this new freedom,
if I find a jug at a swap meet or garage sale for a deal,
I'll pick it up.
Typically $5-10 for an unopened gallon,
dollars for anything less.
So far I've collected new gallons of Kawasaki jetski oil,
havoline and one of pennzoil all new.
Usually it's leftovers from guys who've sidegraded to 4-strokes.

The 17 planes at 4k and a cruise is 3400-3700,
so we're not heavy on the throttle only on occasion.
If the engine dies I'll make sure to make an update!
TP