SAE J300 defines mono- and multigrade engine oils; for example,  cars may need SAE 0W-20 multigrade engine oils while lawnmowers only need SAE 30 monograde oils.
SAE J300 defines mono- and multigrade engine oils; for example,  cars may need SAE 0W-20 multigrade engine oils while lawnmowers only need SAE 30 monograde oils.