I`m using Power Services Diesel Kleen in mine now with 5,000 miles on my LMM,I started using it about 1,000 miles.
I did call them P.S. on if there additive would be OK,which they said yes,of course what else would they say.
GM say`s NO on any additive it is not needed,so I would not broadcast it.
I`m not to confidant on GM knowing much of anything especially if there is no trouble codes.
Actually I`m doing a combo 22 oz. of Diesel Kleen and mixing 10 oz. of Lucas Fuel additive in a 32 oz. bottle and then adding 1/3 oz of this mix per gal.of diesel to the tank.
I`ve used this mix for several years,I don`t think every tank full is a must, but I feel something is needed at least every other.
2007.5 GMC Sierra 3500 BLACK SRW C.C. 4X4 LMM/Allison,long bed,Loaded,Westach EGT/Boost pass side, Edge Insight CTS EGT driverside, DIY stock airbox mod, aFe proguard 7 OEM airfilter. Back-up sensors + Back-up camera tied into the navagation screen, Redi Lift leveling kit, Cognito UCA's, Pitman Idler arm support, AMP Power steps, Firestone Air bags with controller in cab.