Read what these fellows have to say about Oil.
www.acmoc.org/bb/showthread.php?32339-Couple-of-D2-Pony-Questions/page2
Personally in my Pony I use 30 weight but do change it to a 5W-XX when I park it for the winter just in case I need to to start it!
Your D4 is a very late 1951. 1952 started at 158??. catskinner
I use straight 30w oil in both engines
D46U straight blade,D46U cat angle blade,allis chalmers AD4 grader and Khoering 404 dragline. D4C 40A,D4 2T and scraper.
my D4 is a 1953 model 6U. the other is a 1943 model 2T. the diesel engines get 15w40 and the pony engines get 30 wt. be prepared to change the pony oil often because it gets diluted with gasoline. there isn't any copper or bronze parts in the transmission or final drives so they get 90 weight EP or 140 weight EP. i use corn head grease in the rollers.
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