OK, changed oil today and Advanced Auto had Mopar MO-339 oil filter which seems to fit and is listed in many filter cross references. Unfortunately the dealer used Duramax 5/20 oil with a Car Quest oil filter R84060MP when I had the oil changed for my second to me oil change on a 29K mile truck I bought used. I bought Valvoline Advanced syn 5-20 oil and the Mopar filter. But if you look up on the Mopar web site, none of the numbers are correct.
So what is the latest Mopar part number for an oil filter for the 2020 Bighorn in signature? I know Mopar changes numbers frequently, and my dealer won't give out part numbers unless you purchase from them.