When your machine is new, the hydraulic system oil and filter must be changed within the first 50 hours of use and every 250 thereafter. Refill the hydraulic reservoir with engine oil type API SF.CD 15W40 when outside temperature is above 40 degrees F. Use engine oil type API SF.CD 10 weight when outside temperature is below 40 degrees F. Replace filter with Terramite / 21002 filter. It is important to follow these instructions to alleviate any cold weather engine starting problems and any pressure or heat related component failures.
So, it looks to me like 5w40 is the best for summer and winter use in my area.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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