In reply to a message from BobP sent Tue 1 Mar 2005:
The type of fluid to use should carry the specification M2C33F (the
original ‘type F’ fluid) or the later M2C33G. These were both Ford
specifications. Today you are more likely to find the latter on
Dexron fluid specifications are different, and in theory
incompatible, though there is some debate over how much it matters
Since the correct fluid is obtainable, there seems little cause to
use to try to use the wrong type.
If you simply drain the gearbox you will only get about half the
oil out since some 3 to 4 litres are trapped inside the torque
convertor. This means that it would be a good idea to repeat the
operation a few times to cut the proportion of old oil.
Might be an opportunity to clean or renew the strainer too, and
wipe any metal particles off the magnet.
The alternative is to flush the box with a running engine and a
supply of fresh fluid to run in, while draining at the cooler
Just supposing your gearbox has been filled with Dexron in the
past, I doubt if mixing the fluid types a little will do any harm.
The original message included these comments:
Is there a problem mixing automatic transmission fluid types? I
want to pump out what I can and replace it (maybe a time or two),
but the last change was before I had the car: an 86 XJ6 with a BW66
transmission. Type FA was recommended to me, but I don’t know if
that’s what’s in there now. Would there be a problem if it happens
to be Dexron?
Andy Blakey 1983 XJ6 III 4.2 Auto (UK) '‘Jane Seymour’
London, United Kingdom
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