Quote:
Originally Posted by TrumpyAl
Is it safe to assume that you are basing the 5000km advice on personal experience backed with lab analysis?
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I would say safe, except I would change it from personal experience to professional experience as JFP has done thousands of oil changes for his Porsche customers and hundreds (thousands?) of UOA.
Also he is saying 5K miles (5000 miles) vs 5000 km.
That said I changed my DT40 every 6 months/3,000 miles for the couple years I used it and always had a good UOA, even on the first one where I did not flush (previous fill Castrol Edge 5W40). If they made an XP9 that had a drain interval greater than 750 miles I would have switched to that since I am doing mostly track but with the drive to/from that equated to a full oil change each track weekend.
Now I am using Millers Nano 5W40, I am getting ready to do my first UOA and see how it did. That oil can (supposedly) stand up to the heat and stress of track use, and has a longer lived additive package, that should allow me to get back to a 3,000+ mileage interval while still holding up to track use, and this longer life should offset the higher cost of the oil. We'll see
I have one more track event this weekend and then it is UOA time