Mobil 1 Racing 0W30

I know it was discontinued awhile ago, not sure how long.

Here is a link to information on it.

http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil_1_Racing_0W-30.asp

The site recommends 0W40 or 15W50 as a replacement for it. Just trying to see if anyone has any experience with it.