I have a Onan MicroQuiet 4000 genset in my RV. It's due for it's first oil change and when I went to do it, I found a rather large size allen head oil drain plug. Does anyone know what size allen wrench fits the drain plug?
I also plan on buying a fumoto oil change valve for it. The only one available is the "Onan engines with NPT-3/8 plug". Does anyone know if this is the right size?
Thanks in advance!