Question: how do i know what kind of oil to put in my lawn mower?
Answer: Use SAE 30 in warmer temperatures of 40° F and higher (5° C and higher)
Use SAE 10W-30 for a varying temperature range of 0 to 100° F (-18 to 38° C), this grade of oil improves cold weather starting, but may increase oil consumption at 80° F(27° C) or higher.