FCA has been very tight about any specifics that are being tested in order to achieve certification. Seriously, we genuinely don't know what these specifications are. So where do MS-13340 and 9.55535-GS1 fit? You ready for this answer, it's a doozy! We. There are other differences but that is one of the most clear cut ones. API set the standard of 15%, but for an oil to meet GM's Dexos requirement, it must achieve 13% or lower. In the case of Dexos, there are some differences between what the API considers adequate and what GM decided was adequate. When first introduced only Mobil1 met the specification, if you look today, just about all 5w-30 synthetic oils meet it. If it left X below the threshold, Honda gave the certification. If an oil left X amount of deposits over the threshold, Honda wouldn't certify. Due to the increased turbo temperatures this engine experienced, Honda required a lower threshold of deposit formation to decrease coking. HTO-6 for instance was introduced for one engine in particular, the K23A1 used in the RDX. Typically a manufacturer specification is introduced because the manufacturer does not believe current industry standards are suitable for their engine(s). Two that fall into this category are HTO-6 from Honda and Dexos from GM. You then have other manufacturer specifications that go above and beyond API/ILSAC/ACEA requirements. Both of these standards essentially replicate API testing, so as long as an oil meets the minimum API specification called for by the manufacturer, it should meet the manufacturer specification as well. Two examples are MS-6395 from FCA and GM4718 from GM. This isn't to say that they all serve a purpose, because some certainly are redundant. These manufacturer certifications aren't always arbitrary, something I think this board often assumes. However, this seems to be specific to Mobil1, if you look at the Mobil Super lineup you'll find MS-9395 certification still listed. Both the easily attained MS-6395 and more difficult MS-13340. Mobil used to carry certain FCA (then Chrysler) specifications but ever since the factory supplier contract was given to Shell (and taken away from Mobil) we've seen FCA specs removed from the Mobil lineup. Click to expand.You are correct that the lack of FCA oil specification simply means that the oil wasn't tested against the standard.
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