Quote:
Originally Posted by DavidZ
That's why I sent an 18 month sample to Blackstone. They said I could still extend my interval. Is there a better measure of oil "life" than TBN? All the other oil properties look tip-top. Not like I'm trying to save money or anything. Just seems like a waste to throw out oil that's still as clear as maple syrup.
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The better metric is TBN versus TAN. If the oil has become too acidic (TAN > TBN), it will cause problems. This is why I am always telling people to pay the extra $10 for TAN in addition to the $10 for TBN.