Quote:
Originally Posted by hankpage
Diesel oils are designed to hold soot in suspension, thus the the quick black color. The only time I have seen oil run clean is with a "Luber-finer" filter system on an old Detroit Diesel that held 64 quarts. The filter was the size of a small trash can and was very expensive to change. We did oil analysis every 10k usually went 50k before changes. For 10-13 quart engines it would not be cost effective. JM2¢, Hank
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I've done oil analysis a few times just to see how well my oil was holding up and how the engine was wearing. Very interesting info. You are 100% right when you say doing an analysis on a small capacity, 10-12 qt, system to extend oil change intervals is not cost effective, since the analysis costs almost as much as an oil change. It is interesting every now and them to check the wear qualities and see if there are any contaminates to be concerned about, such as antifreeze.