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It shows the cleanness of oil as available minimum particle /100 ml oil sample. size of 5 to 10 micron particle is commended as less as possible. We are using fuel in aeroplane jet engine under 5-10 micron particle available 2 or less means fuel has cleanliness class NAS 2 or less. National Aerospace Standard (NAS)

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Q: What is meant by nas value of oil?
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