went to my local walmart. purchased every quart of mobil1 15w-50 motor oil on the shelf. then proceeded to the local super target. again, purchased every quart on the shelf. how many quarts, you ask. total of 12. what a pita! enough for one oil change. not enough for two. som*****. oh, zip code. 22401. price at both locals, $5.69 for the extended service variety.