AFAIK, in good faith, this is how I determine if the oil to buy is recommended by Porsche
- Go to Recalls | NHTSA. Click on the Vehicle Tab and enter your vehicle, like 2018 Porsche Macan
- A new screen comes up with all the models available. Follow the row of your trim level to the column Manufacturers Communications. In this example lets pick Porsche Macan. Click the number. There will be alot that comes up.
- Now you got to go through them and find the communications about oil. Scroll down for things like Engine and Engine Cooling.
- In the example pick 8/22/22, thats not it
- 7/30/22 Click on Associated Document.
- Click on Associated products and you will see if your car is there. It should be because you chose the right row above, right?
- Click on PDF and its Overview of Approved Porsche C40 Engine Oils (31/22)
- You're not done. Keep going back in time you will See C30, C20, and A40 each with their own communications.
- In the example pick 8/22/22, thats not it
- I would not presume this is forever. They can change. Its not like there wasn't approved oils in 2014. These appear to be the latest in the NHTSA data base.