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Do you do a lot of highway miles? Highway miles are easy miles.
Without TBN testing though, it's difficult to say if you could or couldn't extend your oil change. Sure, wear is good, silicon (dirt) was decent, but without TBN we have no idea how much more acid the oil can neutralize. This oil could be near the end of it's life and did a great job, or it could have done a great job and be ready for more. However, something tells me this oil has plenty of life left in it.
What is the factory recommended oil change interval anyways? 5k? 7500?
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