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help reading analysis result?


This is my first oil analysis. I'll admit a noobie mistake right up front: I asked if they did oil samples and didn't ask with whom, so it's from Titan not the shop Kevin recommends (Polaris? is it?).

Can someone with experience here tell me if these numbers are ok?

The background of the truck was that it had a PM, then sat, I bought it, sat it while I waited for title/documentation, then ran it 15K miles. It never burned or lost any oil in that time. It's from a rebuilt Series 60 with 440K on the rebuild at the time of sample.

Thanks in advance for any guidance/advice/info!!

-- Victor

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The oil, being a 15w40, has lost enough viscosity to just about be a 30w oil. That is some tremendous viscosity loss in 15K miles. That could be from some fuel dilution. The Oxidation/Nitration is a tad bit higher than usual for that time frame, so combined with the viscosity loss, that would confirm some fuel dilution issues. Other than that, the sample is good on wear metals and such. I assume the Soot is a particulate count. Not sure how that equates to a percentage basis. I only have experience with analysis that does soot on a percentage basis. That is the way the Detroit Lube Manual classifies soot limits, by percentage. Viscosity loss can also come from severe shearing under pressure. Either way, the viscosity of your sample is almost near the viscosity of the 10w30 I use in my Detroit at 22,000 miles.

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