[wsmracing]

Any additive, that will increase lubricity & cetene level is good........poor fuel quality will make you want to step up you intervals on fuel filters...just to help mileage & save on injectors.....power service works well..............ford/motorcraft offers additives for 7.3/6.0 & the new 6.4.......which needs all the help it can get in the fuel mileage area