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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.