Bob,
Its been years since I did this on a test fleet but the results you are showing, assuming these are ppm. It would have been handy to see the Mobil 1 virgin data also.
zinc 1199/1283/790
phosphorus 1079/1060/656
molybdenum 705/689/81
lead 0/37/17
The above tell me the following: You still had plenty of the additives
ZINC and PHOSPHORUS which are EP additives (needed for our flat tappet motors). These deplete over time (mileage). On a flat tappet motor we need ppm's on virgin
oil in the 1000-1500 range to protect the lifter face and cam lobes. The Lead is typically from shell bearing wear and indicates a higher rate of wear compared to the Mobil 1
oil, but its still low and I would not worry. The Moly additive is still well represented as well , but I dont remember what the lower limit concentration should be, in any case the Moly level shows almost virgin
oil.
FYI- Many of these oil analysis companies will give you a detailed explanation of what these numbers mean to someone who is not an expert. I would go to their websites or call them for reference. The testing companies that test oils for the large transportation companies truck fleets/municipal bus fleets are the folks to work with; they dream this stuff 24/7!
What you didn't tell us is how many miles was on the Mobil 1 oil (i.e. was it also 1,500 miles on that oil)