???Liteweight???? average 35thou mi per year, rounding off to 4qts per change needed, thats almost 35 changes out of the 137qts!!===at least 10 years worth of M1!!!!!. (Sure glad Mobil has at least a 10 years shelf life.) PS I have over 50++++ FL400s Motorcrafts along with 16 air filters and 10new tires. 98 and 01 Suzuki Swift's averaging 43/45mpg-NO payments-hope to go the next 9to10 years with no more payments!! (just hope no more trees fall in front of me at 50mph as what happened to #2 Metro in a wind storm Dec94/went over 10ft off the ground, 57ft airborn landed nosed into the asphalt and walked away minus one great """cheap""" car!!!)