The propensity for this to occur is why the change to a 9th inj.
Not that it always happens, but it can leak past and into the oil below. Unless you're doing UOA to know for sure, it's best to just change it more often.
Take advantage of the yearly rebates offered and stick with the 1300, instead of the more costly brands.
Funny though, my LMM DIC % depletes much faster than my LBZ does.
Always assumed GM was accounting for the likelihood of fuel levels in the oil with the shorter cycles.
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"