Wrote off impact wrenches on injector cups for 12 years, then a 3/8 stubby in a Freightliner at 2am proved me wrong
Always torqued them by hand because I figured anything with a trigger would crack the cup. Did a no-start on a 2016 Cascadia last Tuesday and the stubby zipped all six out clean, so now I'm wondering what else I've been making harder on myself.