My dad has this 1990s Sears Craftsman lawn mower - I forget what engine he has, but he's kept it running very smoothly. He uses dino 10W-30, but I kept telling him to switch to synthetic.
Do you know what oil would protect the engine the best? the manuf specified 10w-30.
Do you know what oil would protect the engine the best? the manuf specified 10w-30.