Menards has Quaker State UD on sale plus their 11% rebate. How does this compare to M1 Extended performance? During the winter we put about 6500 miles on our 3.5L Explorer, my fall oil change I have been using M1 EP. During the summer we only put 3500 on the EX but we live elsewhere in the winter and I don't have the ability to change the oil myself. The oil change in the spring I use whatever full synthetic I find on sale. It may be M1 or Pennzoil or even Kirkland. The winter miles while its 6500 that includes a round trip of about 3000 miles going cross country on I-80 so the miles are pretty easy and the 6500 in total has few short trips. Would QSUD be ok for the winter leg? Explorer has 105,000 miles, runs perfect and uses 0 oil between changes.