[cas951]

We should all go back to the basics and do what we all normally do when we buy a new product. That is to read the owners manual and see what's recommended there. Chances are the oil recommended in the manual is what was used to develop the engine during R&D which I'm sure Porchse spent many hrs researching and $$ into developing this engine. I'm almost sure 0W-40 is not listed there.

To date I have not found a reason as to why Porsche changed the oil used for older models and use 0W-40 as part of their fill. I seriously doubt there was much R&D done with 0W-40 to older models before this change.

Only reason I can think of is to reduce stock and inventory........