My Craftsman 29CC 4 stroke has some how survived me.
Still running the original spark plug. Have changed the oil 2 times in 6 years. At the beginning of the season I just add a few drops. Have cleaned the air filter twice. It appears to be “self oiling”.
The only problem I ever had with it was when the kill switch failed and I couldn’t shut it off.
For the first 5 years it maintained three 1/4acre yards.
I used it as a leaf blower, weed eater, cultivator (sucks), edger, and hedger.
It may not be a Stihl, but it has earned my respect.