Compared to what? If you buy Honda Dino oil in quarts from parts.net, its more expensive than synthetic. Synthetic maintains it's shear point longer than dino but the oil change intervals are so short due to all the contaminants and lack of filtration that I'm not convinced it has a benefit other than the solvent properties of it. I use it only because I have it for the car and don't want to buy different kinds. For a tool that sees a lot of abuse, it generally needs replacing long before the engine wears out. I can't think of a single tool I threw out because of a worn out engine, its always some other catastrophically expensive part. Perhaps the exception might be an expensive lawn tractor but for lawnmowers and weed whackers, I doubt you could justify it.