ATF is the fluid Volvo specifies as the correct fill for the M46. However, they also specifiy that 10W30 or 10W40 is equally acceptable in areas where temperatures don't get too low (some very low number that never occurs around here). Redline MTL is a recommended replacement in applications specifying 10W30 oil in the gearbox, so according to that logic it ought to be fine in the M46.
Kevin what problems have you seen with MTL? And in your experience, does it matter what kind of ATF is used in the steering? I think the Volvo spec is to use Type F, but it seems like regular Dex/Merc ought to be fine as well...
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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