Was in AAP today and noticed that the 5 qt. jug of Motorcraft 15w 40 diesel oil has a notice in small print on back label that recommends against using in gasoline engines that have a catalyst system. I have seen discussions on here concerning the topic of HDEO possibly damaging catalyst systems, but this is the first time I have ever seen a container of HDEO of any brand cautioning use in gasoline engines with a catalyst system. I looked at the several other brands on display and did not see a caution concerning this printed on labels anywhere. Just wondering if anyone else has seen any containers of any brand of HDEO oil that specifically cautions against its use in such engines.