I was wondering if anyone had used Mobil 1 0W40 European and if anyone had an oil analysis done on it. I will be to my next change interval soon and was wanting to see how this compared to the standard 0W20 variants. I have looked through here and all the posts including the suggested post #35 refer to 0W20.

Also, what kind of mileage hit would one take by using a thicker oil like this?

I have been using Mobil 1 EP in 0W20.