Been using me undies myself for just over 6 years. Theyre started to break down over the last year. One complaint i have is the purple lining they use for the elastic seems to leave a mark around my waist. I’ve been waring them inside out to accomidate.

I’ll be trying some lttstore undies soon. Hopefully theyre similar quality but slightly longer lasting.

I wouldnt underestimate how many cummins engines there are, lots of trucks, tractors and other large machines use them, some of which run constantly. If anything i would say they got off lighter than VW

Could be decent if its not the only layer of protection