I have a 2014 Grand Cherokee EcoDiesel. Yesterday I got a message saying “exhaust filter near full, safely drive at highway speeds to remedy” and my check engine light came on. So I took her out tonight and drove back on forth down the highway for a good hour at 70mph. I parked, Ran in the store...

2014 Grand Cherokee limited, 110,988 miles, original DPF, only the regular maintenance done. No wrenches turned on the motor, ever. I've tried every product I could find to help get the filter to clean out. 7 different brands, in some cases a couple of products from the same brand. Issues...