I just recieved a letter from Mobile containing everything I sent them for their Exxon Superflow rebate. They sent it all back saying I didn't provide proof of purchase. That included two handwritten reciepts and two cash register reciepts for the two cases and two jugs of the stuff. The UPC code is IMPOSSIBLE to remove from the jugs, so I wrote down the numbers. At any rate they rejected the whole thing, including UPC from the cases. I called the 1-800 and pled my case, the customer service rep said she would put in a recomendation to pay, after a long conversation. If I don't get my rebate, it will be a 0w20 day in Hades before I but another Mobile product, too many other good oils out there. BITOG'ers beware!!!!