Let me know how it goes, I would like to give it a try in my 3.7 ram. It has a little piston slap on start up.
I recall that durablend 5/20 in my "piston slapping" 4.8 silverado totally disappeared during the one time I ran it. I traded the truck before i could reverify that fact, but the proof was in the pudding. Mobile one 5/30-slap ,gtx 5/30- slap, pennzoil yellow bottle 5/30-slap, pennzoil + lucas- lots of slap, durablend 5/20 _quiet and smooth.
Was it the vavoline or was it the viscosity change ?? I dont know, but I plan to try it on my dodge.