blackhat620
You Had to be There
This article from FMC explains how to maintain and maximize the lifespan of the EGR valve in the 6.0 & 6.4 PS.
www.fleet.ford.com/truckbbas/non-html/DeiselTips/DSLEGRSS.pdf
www.fleet.ford.com/truckbbas/non-html/DeiselTips/DSLEGRSS.pdf