USE Synthetic ATV OIL, it comes in various weights. Valvoline makes it, but Lucus makes a good oil but it is 8 to 10 dollars a quart.
You do not have to use so-called ATV oil. ATV oil is the very same oil as used in your automobile. Use any major brand SAE oil in the correct weight. I recommend you use a 100% synthetic oil.
If it is air cooled I highly recommend synthetic. If it is water cooled then it is not as important but I would still use synthetic.
A simple answer it's oil for your ATV.
Polaris four stroke oil is a 0-40w synthetic.
No, you need to use an oil that is wet clutch compatible, which Mobile One does produce. Read the labels on the bottle.
It is important to use the proper engine oil in a Honda TRX 450 ATV. The manual recommends that top grade synthetic 15w - 30w oil such as Motorex Top Speed 4T Synthetic .
SAE 10w30 full synthetic.
1.9quartz, full synthetic
No difference. Automobile motor oil is 4 stroke oil just like the oil you use in a 4 stroke ATV. Just purchase the correct weight of any name brand. I recommend you use 100% Synthetic in any air cooled engine.
Yes, that is called a blend.
No, old oil can use synthetic engines