Hi. I'm going back to do some Maintenance/Service on my wonderful 1983 Ford 1700 and find myself back to being curious about "Hydraulic System Oil" that the manual talks about. It certainly says I should get the M2C-134(x) ...which I am not finding, where the "x" is either A, B, C, D etc. and knowing they're backwards compatible. But the manual also says, "Should the recommended engine oil not be readily available, use a commercial oil as shown in the following chart" and that chart goes on to list SAE 10W30, 10W40 for Year Around. Or SAE 10W... and a few other options given the temperatures outside...
But my question/concern is: I am planning to do as much maintenance as possible - and going to work on the front differential, front axle, rear axle etc... So can I just put SAE 10W30 in all those places? Because it looks like the M2C-134A is what they say to use in them...?
Thanks. Hope i'm not being overly exacting here - just don't want to hurt my machine. Thanks!