They don't typically publish NOACK info anymore, but the ESP should be less than 10% for Xw30 since they carry MB229.51 and MB229.52, and below 11% on 0W20 because VW 508/509 and MB229.71 limit the NOACK to 11%. If you really want to know, your best bet is to email technical support at XOM and see if they'll tell you, otherwise it's guesswork.