It's all a cover your butt thing, I went to wal-mart to have my tires rotated, they wouldn't touch them because one tire was wore beyond spec, but I could drive away like that, my dad took his oldsmobile to walmart for an oil change, they wouldn't do it, because the oil plug was too tight. It's all lawyer b.s. to protect them from lawsuits. Don't know that I have ever torqued my lug nuts, but then again I'm not a department store mechanic. If I am at home I will first tighten them with an electric impact, then tighten them with a 1/2 breaker bar. I always say that tighten them until they break then back off a quarter turn.
