You need to put diesel oil in it. Save the gasoline oil for your car/other equipment.
GR2100 is the gasoline engine, right? I believe G2110 is the diesel. Where are you located at? Hot climate, cold climate, or a mix of both? All of my equipment, gasoline or diesel, small or large enigne, offroad or onroad, gets Mobil 1 5w-40. This one oil covers all my applications. Philip.
Yeah, thats what I did, but it seems to me that I read somewhere that oils classified SL-SM also met the requirments for the same viscosity in the "C" oils. However, better safe then sorry...I went for the diesel oil.