Attention: TDR Forum Junkies 
Joseph Donnelly
TDR MEMBER
I recommend Fleetguad, LE, Amsoil etc. fuel additive if you just have to add something (I don't).
Never use ATF, used motor oil, or some concoction. The fuel system has clearnaces in the millionths of an inch and can't tolerate "grit". As pressures go up, it became necessary to reduce clearances so the high pressure fuel wouldn't leak past the pressurinzing parts (plungers, etc). So, the tolerance is much lower with today' systems.
Never use ATF, used motor oil, or some concoction. The fuel system has clearnaces in the millionths of an inch and can't tolerate "grit". As pressures go up, it became necessary to reduce clearances so the high pressure fuel wouldn't leak past the pressurinzing parts (plungers, etc). So, the tolerance is much lower with today' systems.
