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My 1950 f1
Maintenance on an old truck isn't that different than it is on a new car. They need all the usual stuff like plugs, points, oil, chassis lubrication, etc. There are also a couple things that you wouldn't normally think about doing--like periodically re-torquing the head bolts. For detailed information and procedures I suggest buying the 49-52 Shop Manual, which is available in reproduction from the usual parts vendors. For quick reference, see below.
Engine Oil: Ford suggests 20W for temperatures above 32 degrees (Fahrenheit). Notice that's straight weight oil (i.e. not 10W40). There is a debate over whether it's safe to use multi viscosity oils on an old engine. It's possible that the detergents in the modern oil will loosen the sludge in your engine and clog the oil passages. Some people don't worry about it though. When I first used my flathead I used multi-vis oil and didn't have any problem. I did switch to straight weight after somebody told me about the detergent issue. Ford also suggests changing oil every 2000 miles (or 4 times a year) under normal duty. I wouldn't change it any less than that. The oiling system on a stock flathead isn't all that great, and the filter might as well not even be there, so frequent oil changes are your best protection.
Transmission Oil: SAE 90
Steering Gear: SAE 90 (though if your steering is sloppy you might get superficial improvement by using SAE 140.
Rear Axle: SAE 90
Chassis: Pressure Gun Grease and penetrating oil. See chart for locations.
Don't forget the little things like oiling the fan bearings, distributor, and generator.
A bigger, easier to read, chart can be found here.
Chart is from the 49-51 Shop Manual. It's a must own!
