"miles on engine" would be irrelevant as this is (as stated) a virgin sample from Brad Penn, 20W50.

I seem to be fighting Lab accuracies here,.... (GEEEEZE) The first virgin sample returned a 6.5 TBN, of which rx'd many "WTF"s? It looks like I go from Blackstone's Z & P errors (having the manufacturers in an uproar) to questionable TBNs on BP (this is exhausting....)

CHARLES: do you see this (2nd pass) TBN as typical?


Thanks to all!!!

My best,

Sample was virgin...(no miles)

sorry for the double post,...she's finiky tonite,,,

Does anyone here have any additional comments on Royal Purple Max Cycle 20w-50? I'm thinking about buying another 5 gallon pail for my 3.2.

Thanks for the help.

Go ahead, it's still as good a choice as Swepco 306 or Brad Penn 20w50, just make sure you keep an eye on the cat (or put in a bypass), as I've had one customer get a clogged cat from running it.

Thanks Charles!

No problem!