I use Mobil 1 0w20 16oz mixed with 4oz of Marvel Mystery oil in my clone with no problems and I know a few others that do too. You can’t go wrong with 4T or redline though. If you can’t get 4T just use the Amsoil Dominator 5W20 synthetic.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience