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API TC is the only remaining, not revoked classification of the API Two-Cycle motor oil specifications. URL: wikipedia.org/wiki/API-TC
Modern advanced two-stroke oil will use API TC+ (to impress ?)...

Which oil would you prefer:

Tornado, which is a 2-stroke oil that is 100% synthetic for high speed, heavy-duty air-cooled 2-stroke engines.

Or

Atlantic, a 2-stroke oil based on premium base...

Why would they have a hole in the cylinder wall?
There must have been an engineer who saw an advantage.
Who can explain this?


Upon further inspection, the hole in the 10xs seems to be closed....

Ok. You mean the two small holes (red accented)

62620


If I'm right, the driled cylinderwall can also be seen at the 10XS
(If this is at least an original 10XS)

62621

That's for the vacuum needed for the carb.
(I guess)
At the normal block they found another solution.


Image before engine revision:
62619

Yes, I want a faster Merc 15hp
and am very curious about the modifications that Mercury did to their little 10XS.

What's "simple" possible without losing reliability ?

During the overhauling...

I can not find a difference with our Merc 15 (2000).
Only grease, a lot of thick grease.

I use a little teflon lubricant.