Good day to all. I really don't advice diesel additives or any form of additives. Using it is like, you are trying to lie or cheat your engine. I'm not so sure how to explain it, but its like telling your engine you are using this kind of fuel, but it's not. I am not sure if this helps. I agree with the post above that changing oil is one way of keeping your engine running smooth, since it is just so dusty here in the Philippines.