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I put an M41 w/ Dtype into my 444 back in '76(?). Ran it for 20 years with Castrol 20/50, including two cross country trips. Only problem, was that it leasked a little from a broken off stud. I'd know I was low when, going down the road at 75, it'd drop back into 4th. Pull over, undo the shifter and and add 1/2 a quart.
5 years ago, I got a 122 and rebuilt an M41 with J type and have been running it with 20/50. No problems yet. I live in the northeast where it gets colder, and wonder if climate should be any kind of determining factor in this discussion. Would there be a reason not to use a multigrade, if you were going the enine oil route as opposed to 90 weight or ATF?
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