I love how the Schaeffer's performs in both the summer and winter. I drove 50 miles this morning to buy a case of the 701 which should last me 'til next summer. Last winter I had absoulutely no problems with either the 10w30 or the 5w30 blend. The oil seems to hold up really well even though I haven't had any analyzed. I don't think you can go wrong with this oil.