Blackstone should not even have a line item on their report for fuel dilution, since they don’t really measure (with gas chromatography).
I wonder, assuming you are inclined to continue with Pennzoil, if bumping up to Ultra Platinum, or maybe a euro spec Platinum, would help. It won’t cure your fuel dilution, but it might mask it by starting with a higher viscosity, and/or having a better add pack. I would love to hear Pennzoil’s reply to this “advice / opinion,” because maybe I am full of cak, but an important question for them is if it would endanger your Pennzoil “warranty.” I am concerned with similar problems in my EB; I will miss your reports (since you are going “annual”). I’m probably going to say goodbye to Pennzoil though, or at least the ILSAC SN+ version of Platinum. I recently filled with Ultra, and if that produces a better UOA, I have another jug I can use for the next fill. Euro Platinum A3/B4 potentially sounds even better, assuming I can get the “regular SAPS” version here. I won’t need a change until mid or late summer though.