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What is to high on nitrates?

I have DD 15 with 570,000 miles. I have 115,000 miles on oil running an O P S. My nitrates are at 33 with every thing else ok.

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http://www.polarislabs.com/test-explanat...

I don't know what number would be to high, but nitration on it's own is not a problem. It has been said that the oil formulations have changed to higher nitrates, but it is up to the engine manufactures to change the allowable numbers for warranty reasons.

There is nothing to worry about unless your TBN is dropping and Viscosity is rising.

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