I was told by a friend of mine I should be adding a fuel addative to my diesel fuel. I own a BX2350 with a 24 horse power diesel engine. My friend is a mechanic on large diesel tractors, bulldozers, etc. He adds fuel addative to every tank of gas. This seems like over kill to me. Any suggestions on fuel addatives for smaller diesel engies and how often they should be added to the fuel? He suggested Sea Foam and said it would help clean the engine.