I used Walmart Super Tech blended 10W30 for years in my wifes 97 Taurus, a few months ago I used the free offer and got 5 qts of Maxlife 10W30 (dino) and put it in. This morning after an overnight low of 28 I had a hard time starting it. I changed the oil to MobilOne 10W30, will check it in the morning.