Well Dwinkie the opti lube is just preventive maintenance just like using a good oil and changing it regularly for the sake of the injectors. I also think that a fuel pressure gauge is good to have for the same reasons. I believe in this forum there are threads about running the fuel out or low on pressure and that it will hammer the injectors to death. My feeling is that all these things work toward keeping our trucks running good and that is the point is it not.