Ok, my apologies. Castrol changed 0W40 pds on 04/25/2022. I didn’t see new pds on the last month.If you read my post attentively, you'll notice I said: "I just looked at Castrol's website". If, when you get a chance, you'll go over there to take a look yourself, you will definitely find only one product data sheet for 5w40 and one for 0w40. There are no old and new data sheets in there - you seem to be confused. Those respective data sheets show that 5w40 is definitely a smidge thicker with a definitive extra manufacturer certification vs 0W40
Regardless of approvals, 0W40 is still PAO based oil. But I don’t that the pour point jumped to -45.