When I bought my '16 Limited it was a 1 owner truck that had a decent record of maintenance and was fairly clean. It had the obvious fluff and buff from the dealership done but even looking beyond that it was a clean truck. I always used AmsOil "Mudslinger" on my trials bike fenders to keep dirt and mud from sticking to them during an event. I figured it was worth a shot to try it on those area of the truck. But before I order another case of the stuff I figured I'd ask what everyone else uses. I'm looking for a new/clean, dull shine not a greasy finish. Since installing my Vararam and removing the engine cover it's obvious it wasn't removed before to clean the intake manifold or valve covers and coils.