our cetane rating sucks here,,like 40-42, i knew the old idi needed like 50-55 or something closer to that,so whatever you can do for our watered down cat pee diesel,will improve it,,i think redline makes a good one,ive used it a few times,,it actually looks thick when you shake it,,they have it for cat+non cat ,,i always grab a few bottles when i haveta go to summit,so i know they got it,,,,stanadyne is good stuff too,,,,,,i borrow that from work :roll: