I tow aboat alot.
3010 miles on oil. Still using the oil, No change.
47,163 on engine.

Sample test Universal avgs. for 4900 miles.

Aluminum 2___________________________3
Chromium1____________________________1
Iron 16_______________________________13
Copper 2______________________________4
Lead 1________________________________4
Tin 0_________________________________1
Moly 50 ______________________________66
Nickel 0_______________________________0
Manganese 0___________________________1
Silver 0________________________________0
Titanium 0_____________________________0
Potassium 1____________________________1
Boron 32 ______________________________64
Silicon 9 ______________________________13
sodium 2 ______________________________13
Calcium 2716 __________________________2190
Magnesium 11 _________________________93
Phos. 629 ____________________________712
Zinc 725 _____________________________832
Barium 0______________________________0

TBN 4.8
Balckstone was suprised when I got these great wear numbers while towing alot. They stated below avg. wear except iron and that the 3pmm isn't an issue. They stated Nice engine!

SUS. VIS> 56.9
Flashpoint 360
Fuel TR
Antifreeze 0
Water 0
Insol. 0.2

I'm very happy with this UOA

Good numbers... you should have posted this here (http://www.clubtitan.org/forums/showthread.php?t=43)

Pennzoil Platinum is a grp III syn. oil and look at those good numbers.