My 2018 GMC Canyon makes exhaust fluid for diesel engines. It crystallized around the lid and occasionally dripped onto the side of my truck. The factory cover turned out to be faulty and I've seen other comments online from people having the same issue. The dealer couldn't/won't get me a new one and didn't seem too concerned about the DEF leak. It looks like this cap might fit, so I gave it a try. Works perfectly. There are no more leaks.
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