Coupons.com has a printable coupon
for $4 off any 5-quart jug of Valvoline Motor Oil; redeemable at Walmart. Stack it with the 5 Quarts Valvoline MaxLife 5W30
currently on sale for $16 - $4 off coupon = $12
($32 at Amazon). Note: You'll have to buy the oil in-stores (not online) to use the coupon.