Quote:
Originally Posted by Mr.47
Next time you should get TBN test on your oil, it tells how's the oil (health) additives are holding up and perhaps could extend you OCI a little longer.
Generally the N63's V8 can be very hard on their oils especially from a thermal aspect, a good practice of changing before 10k miles usually can help prolong the rubber gaskets, valve guides seals and timing chain and guides.
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Beware that TBN and/or TBN-TAN is not as relevant as before due to the lower sulfur in fuels. Also, the components in additives have changed over the past decade will result in rapid TBN drop, which will give a false alarm, but remind very stable after the drop. Some OEM have quietly dropped the minimum TBN requirement or tests on their service guide.
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2019 Cayenne Turbo
Gone but not forgotten:
2006 2.0T A4 Avant, 2007 Z4 Roadster 3.0si, 2006 M Roadster, 2013 550i M Sport, 2015 Cayman S, 2015 X5 50i M Sport