Quote:
Originally Posted by kyrix1st
I wouldn't recommend using the same oil for more than a year unless the manufacturer specifies it can be used for longer interval.
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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.