I have a couple cars that get driven typically only a few hundred miles per year. I'm approaching the 1 year mark and instead of changing the oil, I'm wondering if an oil analysis (with TBN?) will tell me everything I need to know if it's still okay to keep using the same oil? Since it's about the same price of changing the oil vs. doing the analysis, I could just change the oil and filter also (it would be nice to not have to do it though, and also not have to start w/ the lower oil pressure for a split second after the change while it primes).
Would the TBN be the main factor that would tell me if it doesn't contain too much acids, etc. and it's still good to use?
Would the TBN be the main factor that would tell me if it doesn't contain too much acids, etc. and it's still good to use?