New to me 2007 Audi A6 3.2 Quattro. I’m having trouble figuring out which atf to use in the zf6hp19a with trans code JMM. I think it originally come with zf lifeguard 6 but many online parts places recommend zf8. Other info suggests that transmission software may have been updated during production or by dealers to use zf6+ or zf8. Does anyone have experience or info on what atf to use? I’m also open to using aftermarket fluids. Thank you in advance.