An oil analysis can give a good indication of engine care and use. While sellers usually will have fresh oil and filters, and since no oil change is absolute, after a sea trial, the analysis will pick up metal particles still in pan/oil galleries.
Since bearings, cylinders, rings and valves all have different alloys or metals. with careful analysis you can find evidence of infrequent oil changes and excessive heavy use.
Most yacht engines are rated light or recreational duty. Usually 1-2 hours at hp rating for every 12 hours. 100 hours of wot in a new engine with fresh oil will show up. More so with a turbo.
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