Quote:
Originally Posted by e92zero
I did that before and it indicate that my oil still has plenty of life left at 7500. However, I notice the engine feels/sounds different and easier to stall going up hills when the oil has around 6000+ miles on them. So I will just stick to the 7500 interval that seems to be working very well for me. Or perhaps you are thinking of something else with TBN+TAN?
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TBN + TAN is one of the best indicators if the oil needs to be changed. The particulate count isn't totally worthless, but there are things like particle streaking that can cause panic when there's no need.
If you've done TBN + TAN and things are in-check at 7500, I'd argue you could go further. But if it gives you peace-of-mind to stay with 7500, more power to you.
Just out of curiosity, what were the TBN & TAN values at 7500 for your motor? On both of my UOAs at 7500, they were both between 4 and 5.