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just like you would in a gas engine, hopefully you have an oil pressure guage it will show low oil pressure. You could install your own oil presssure guage too. The only other way is to look on the mileage or hours meter to determine usage. Since you did not clarify whtat we are talking about, like chevy , catapillar etc, that is about as far as i can explain. Also engine noises can be a big determining factor for engine lubrication, like upper valve noises.

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Q: How do you diagnose defective oil pump in diesel engine?
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