For Prime members only, Amazon offers the Castrol GTX Magnatec 5W-30 Full Synthetic Motor Oil 5-Quart Bottle for $14.90 with free shipping via the directions below. That's $2 under our August mention and the lowest price we could find by $5. To get this deal:
  1. View the Castrol GTX Magnatec 5W-30 Full Synthetic Motor Oil 5-Quart Bottle for $19.88
  2. clip the $2 off coupon on the product page
  3. order via Subscribe & Save for a final price of $14.90
Note: Be sure to cancel Subscribe & Save after your item ships to avoid being billed for future shipments.