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While I think PW's test is a good one, I think a clinical lab test does go a long way when determining the potential of purchasing a diesel engine (or 2!)
The lab tests look for a myriad of telltale signs including things like metal shavings indicating wear, odd pH and scorching indicating ring issues, etc.. etc...
These tests are well worth it. If the owner changed the oil especially for your viewing of the boat, it's a good chance there is a problem he's hiding.
Maybe as part of the purchase process, you can specifically communicate with the seller letting him know you are conducting a lab test on the oil and he should not change it.
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