Plugging EGRs and return lines are very common and can lead to excessive oil burning and a destroyed engine. Sounds like a good maintenance move to me if you are burning oil or getting an EGR CEL. Their approach is certainly better than many dealers who replace the EGR rather than simply cleaning it. That being said it is a relatively easy DIY project.

You don't loosen any bolt to remove the serpentine belt. It is on a tensionser which will deflect allowing the belt to slip off when the bolt is torqued.

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