Question

which grade of oil is used in oil bath type air cleaner of automobile?​

Answer 1

Explanation:

These days, I save the drained oil from my oil changes and use it in my oil bath air cleaners - so it might be a 5W20 or a 15W40 or even a straight 40W - it's all good. The thing to remember is the oil is there to catch the dirt in both the bath, and the wire mesh above the bath.