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Old 03-18-2013, 06:35 PM
rlitman rlitman is offline
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Join Date: Sep 2009
Location: Long Island
Posts: 1,355
Originally Posted by birddseedd View Post
I do not understand the concept of mixed fuel in a 4stroke.
Stihl (among others) makes an engine they call 4-mix.
It is a 4 stroke engine, with valves and all, however the fuel is sucked through the crank case just like a 2 stroke engine, so there is no oil sump.

It has the lower emissions of a 4-stroke (less unburned fuel in the exhaust), but no oil changes.
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