Use the printed coupon (available at the store if you dont have it) and get $10 off a case of (6) 1 quart bottles of Mobil 1 Synthetic. It works out to $4.50 per quart. They have 10W-30 and 5W-20. Regular Costco price is $36.99. Limit 3 per customer.
Started 10/13, not sure when it ends.