[loweredd]

The report is odd. Usually they have a column like the bottom, where it says an acceptable range. The middle says unit/location averages?? Universal averages on the right column might be what you look at. That middle column is strange though. It's not an average of your 2 samples??

 

[loweredd]

Zinc is from the oil's additive package. You WANT high zinc. Silicon comes from dirt. I know that one from big truck oil tests. If that is high, it's a sign of unfiltered air, or dirty air filters.

 

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Class 8. I used to do a sample every other oil change just to make sure there were no surprises.

 

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The Detroit Diesel lab that I always sent mine too asked what oil the sample was. I would think they should already have a sample of whatever oil you are using for comparison.