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So by mechanical we are talking this type?
https://klmperformance.com/products/mopar-68393978ab-2019-to-2020-6-7l-cummins-relay-intake-heater-grid?variant=39362746384468
Any that meets manufacturers specs will do. Supertech from Walmart all the way up to the boutique oils like amsoil. I went with Napa house brand as it was on sale at the store when I went in to buy that day.
What years your truck? New style relay I presume? The one that’s in the pic with your air filter should go to grid relay, the other may come off the pass side positive battery post under the little plastic cover if you trace it back, let us know.
You don’t need a def tank replacement for crystallized def. What a same they ripped you off. You need to know why the code causing the message is to further diagnose.
Last post bc this is dumb, but here’s a older article from a respected fire service trade magazine on the implementation of emissions on apparatus, and the 2nd is a new article from another well respected magazine on where they are going for 2027...