 Now through December 28th, Castrol Edge and Edge High Mileage Motor Oil are on rollback at Walmart. Claim based on sequence dime test under high load conditions versus API SP test limits. The light is fading, your hands are sore, and the last tool has been put away. Now is the time to feel the satisfaction that comes with a job well done. But when you get your tools from Harbor Freight, something about the job feels a little different.