Just thought I pass along the clearance I found at Menards over the weekend. 4T snow thrower oil in 5W-30 flavor for $1.89 a quart, plus an 11% rebate if you're so inclined to go through the hassle. It's the first time I've seen a 4T oil in a weight less than 10W-40. Would likely work well in summer OPE, too.
http://www.menards.com/main/p-2287677-c-10105.htm
http://www.menards.com/main/p-2287677-c-10105.htm