Troy-Bilt Chipper Shredder "changing oil vac" Questions

...much better than conventional oil in an air cooled engine. Change the oil once a year. I want to change oil in my leaf vac.chipper its a tecumseh 8 horse, horz. shaft. what kind of oil shuold i

oil, doesn't start. Troy Bilt Chipper Vac about 20 years old, hasn't been started in 2 years. Thanks for your help. unscrew the nut on the bottom of the carburetor and remove the float bowl it must be

...Oil level is fine. Air Filter was cleaned. If I had to guess?? I think the carb is out of adjustment - Lean setting...(?) try changing spark plug, if unit sits outside rain can rust the coil but I ...