Can anyone decipher an oil sample??

The oil viscosity is only one ingredient of good oil. There are numerous additives that get used up over time. The long interval will show higher levels of contaminants because they are comparing to normal benchmark levels based on 40K intervals I would imagine. We like to see at least two consecutive oil samples with consistent contamination problems before we look into it further.

 

How to read a oil analysis report. http://www.polarislabs.com/oil-analysis-report.php

 

Lots of trucks out there, don't ever be pushed into buying something because "time will run out". There is always another truck.

 

The question to really ask is if you are having a higher than normal oil usage. Blowby is normal and if high, so will your oil consumption be higher than past experienced. Blowby is measured with a water manometer or should be, and there is a specified range, but a higher than normal reading is usually accompanied with high oil usage. There are other internal engine problems that can cause a high blowby issue if you aren't experiencing a high oil consumption problem. A good CAT mechanic should know how to differentiate the other issues. I believe CAT was stating oil consumption is relational to gallons of fuel used, not oil usage per miles driven. If you haven't had an increase in oil consumption then use it as a benchmark as previously suggested. When were the rod bearings changed? If it has over 500K on the bearings then I would suggest getting a bearing rollin done (soon), and you may find that some of the metal content, is part of normal bearing wear because of the metal content in CAT bearings.

 

x2...! Though, if it's a cherry day-cab, they are not easy to come by.

On the oil sample, I have been led astray before by someone inputing the wrong information into the 'machine' and it produced a false bad sample...had me sharting bricks for a while untill I had it sampled again and it came out fine.

 

62 000Km = 38 533,25 miles.