Just ordered me some DT40

[JayG]

Originally Posted by steved0x

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

Gee thanks Steve!
Introducing yet another oil, one that is even more $ than DT40 LOL
In looking at the specs, it is very similar to Motul 8100, with Motul maybe being slightly better spec, if I am reading them correctly.

In any case, looks like a very good oil

https://www.motul.com/system/product_descriptions/technical_data_sheets/52/original/8100_X-cess_5W-40_(GB).pdf?1458898826

CFS 5W40 NT - $19.95 : Performance Racing Oils - Millers Oils

And would agree that flushing the oil is a waste of $$. It really only matters to what a UOA says

[steved0x]

Originally Posted by JayG

Gee thanks Steve!
Introducing yet another oil, one that is even more $ than DT40 LOL

It makes the others look cheap! It is an expensive kool aid for sure.

[Flavor 987S]

Here is a recent VOA for the DT40. As you can see, it is NOT a high ZDDP oil. About the same as Mobil 0W40. I've tried DT40 in two different Porsches, my 2006 987S and my 2014 991S. The results via multiple UOAs were just fine....but no better than Mobil 0W40. And worse than Red Line 5W40 in the case for my Boxster.

Since I was looking for a better result (than M1 0W40) I switched to the Mobil 5W50 that is Porsche A40 approved. I've had the best results so far with this oil, and have been using it for over 6 years now (and about 80,000 combined miles). Very easy to find now at Napa Auto Parts (on sale recently for about $6/quart).

Mobil 0W40 is a good oil. DT40 is slightly better. Mobil 5W50 is slightly better, again.