The 6 month warranty is only for rebuilds that are supplied from the buyer. To me that makes sense, why? Because people are idiots and don't take care of their trucks. I guarantee you people get a call from someone at Warren telling them their 150k mile injectors look bad and that they should consider new solenoids and/or spool valves or just spend the money on remans, and the customer says no. Then they go hot rod their truck with improper maintenance and wonder why their injectors go bad. 30 psi of fuel pressure, bad oil change interval, wrong oil, low HPOP pressure, and then they blame Warren for "bad" service. I Don't own my own business but I'm assuming that's why they only offer a 6 month warranty on customer rebuilds. IMO