An oil anaylisis will tell you many things. It will tell you what type's of wear metals copper, tin, lead, ETC..are present in your engine oil. It will also tell you if any antifreeze is present, silicon IE sand or dirt levels or any fuel level of contamination and the condition of your oil at the time of the sample ( the oil could have been 20% used up or 100% used up ). This test will also gives you a base line on your truck once taken allowing you to determine if something is going on inside internally.
This is MY quick low down of what an oil analysis does, but ask a professional such as (Screen name Georgecls if I remember correctly ) on this site. I believe he run's / owns the AV Lube site advertised on this site and probably on a banner on this page. From all what I have read he is an extremely knowledgeable professional type of person, and seems to be willing to help you in any way possible. I will be doing business with him in the future as a new Diesel owner myself. Just my .02 Fran
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