I am glad this thread got brought up.
With a 4 cycle trimmer, does it have a dipstick, and crankcase oil, like any other 4 stroke implement engine does? If not, I wonder if the Stihl is like an R/C plane engine with valves, and is 4-stroke, but uses the same nitro fuel (containing oils) that the two-stroke nitro engines do.
If there is crankcase oil, what about angles of use? I'd think that'd be critical.......I mean, the whole reason they were 2 stroke to begin with was because they would see unforseen angles, and crankcase oil would run out in some cases......depending on how the owner held it - and the height of the owner- etc......