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So, a little known fact for you, the German outdoor power tool company, Stihl, uses a BMW airplane engine concept from the 1930's for some of it chain saws. One of the Stihl engineers was touring the BMW museum and saw that back in the 1930's BMW produced an airplane engine that had no oil sump and instead used a "2-stroke" Oil/Gas mixture to lubricate the engine. Stihl calls the engine technology "4-Mix". I have one of their pole saws that has the 4-Mix engine. It is really neat to hear it run, if you are used to power tools with high-revving 2-stroke engines. It is also quite powerful.
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