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Message: <blockquote data-quote="Richard L" data-source="post: 622276" data-attributes="member: 52972">As Bill E stated, no vehicle manufacturer tests ATF fluids for other companies or brands.  Ford publishes the specifications for Mecon-V and it's up to the oil companies to formulate their ATF's to meet or exceed those specifications.  It's also important to note that Ford does not actually make the Mercon-V that is put into their vehicles on the assembly line.  Mercon-V is made by one or more of the major oil companies, so the formula is not a secret and is no better or no worse than any other brand.  Ford uses a semi-synthetic fluid while many other oil companies may a fully synthetic, 100% Mercon-V compatible fluid, but will charge a bit more.Valvoline's carefully worded statement appears to indicatate that their ATF is Mercon-V compatible, but falls just short of saying that ????  I wonder if someone had their transmission fail and Ford said Valvoline's MaxLife ATF was not compatible, and that is a "CYA" statement ...Rich</blockquote>