IF it is virgin olive oil it will be fine.
Bad things will happen. Mix oil is designed to burn with fuel so it will not lubricate the piston enough and you will sieze the engine.
The oil to use in a 2002 Montana depends on the climate. In summer, use a 10-40 wt oil. In the winter, a 10-30 wt or even a 5-30 wt is alright.
always use 5x30
30 wt oil
30 wt
Depends on your fork setup, rider weight and your riding ability. Fork oil is available from 5 wt (thin oil = quick action) to 30 wt (heavy = slower action)
5 wt.
Almost 1qt, they usually take SAE30 wt oil as well.
20-50 wt motor oil OR HD Primary oil
533ml of 10 wt
11.6 oz 15 wt for my 05
Any brand 90 wt. oil will do fine.