Motorcycles, ATVs/UTVs and dirt bikes present different challenges to motor oil one formulation can’t meet. It’s best to use an oil made specifically for the application.
Motor oil contamination is the result of chemical changes to the oil, in addition to the accumulation of dirt, fuel, metal particles and other contaminants.
A good motorcycle, ATV or dirt bike coolant must dissipate heat, prevent corrosion and last for years. And it should be pre-mixed with high-purity water.