Re: tranny fluid ?

Posted by Tim Cole On 2009/5/11 20:02:51

As already stated, Dexron has a friction modifier (creates slip) that is of no use to Ultramatic. Type A is straight mineral oil (10w) and is still available. Type F contains detergents plus ZDDP which (according to one patent I was looking at) can corrode copper alloys (great news for the Packard 12) under certain conditions involving heat when not balanced by a neutralizing additive. So if the Borg Warner Simpson transmission does not contain any bronze parts that may be a warning sign.

However, with Type A you need to pay close attention to the maintenance schedule.