I have a 14 Ultra Limited with the catalyst. I have always used Mobil 1 oils in my 3 HD's. I used to run the 15-50 in my 2000 with no problems. I have a stash of the 15-50 and was wondering if it would be ok to use in the 14 even tho it says it has extra zinc for wear protection. Will that hurt the catalyst? It's under warranty for 5 yrs.