I have a basic 4-stroke Craftsman lawnmower (push type). Can I change the oil
with any kind of car oil, such as Pennzoil 10-W-30, or is it better to use an oil
specifically for a lawnmower?
The best oil to use if you don't know what was originally in there is
S.A.E. 30. 10w-30 will work, but it should be avoided because it contains too
many detergents and is lighter than straight 30. Packaged "lawnmower" oil is
simply S.A.E 30 in a smaller bottle that costs twice as much. You can buy a quart
of Penzoil 30 for the same price (or less) than a pint of "lawnmower" oil.
