Dunno, maybe I brain farted . It said after the break in change which is 50 hrs. I run Mobil 1 in my GMC Truck so I know the great quality of the oil, Maybe I should stick to what I know and run it in my BX too. I just like to check out all my options first. Hell, it took me 8 months to decide on which tractor, let alone which oil to use/w3tcompact/icons/smile.gif I will prolly do the same at the first service too. Thanks for the advice.