While both above oils are SN , starburst seal oils - only the M1 5W30 oil is Dexos 1 approved . I get that there is no need for a Dexos 1 approved M1 10W30 - mainly curious what the M1 10W30 may be missing in the way of ad pak , etc. as compared to the Dexos 1 approved M1 5W30 and if there is much difference in performance with the M1 10W30 ?