IMHO penzoils got the tcw3 line priced about according to what you get. Have rebuilt engines run on the plus and the 100% and both showed great wear, but the 100% was noticeably cleaner with less carbon. No experience with XLF, but would bet where it's priced in the line would tell me the most. "Seasoned" could be a marketing ploy akin to "high milage" oil? could be just to capture more shelf space? could have some more dispersant for old engine carbon?
Heres a VOA, that doesn't tell you jack, but I had saved it.
PPM:
copper - 0
iron - 0
chrome - 0
nickel - 1
titanium - 0
vanadium - 0
silver - 0
lead - 0
tin - 0
aluminum - 0
silicon - 2
sodium - 1
potassium - 0
moly - 0
boron - 2
barium - 0
calcium - 14
magnesium - 0
phosphorous - 28
antimony - 0
zinc - 38
