PK from KY
Junior Member
I own a 2019 Laramie 2 wheel drive. I have 113,000 miles on it. The miles are about 85% highway miles at speeds of 65 - 75 mph. I know the book states to change the plugs at 100K miles, but never a misfire and I still get 22.5 mpg - 24 mpg as long as no strong headwind. If all is good do I really need to change the plugs ? Also what is the consensus on rear differential & Tranny fluid changes as there are no leaks and no problems at all.