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The following information is from the Wisconsin Instruction and Parts List for VE4D and VF4D Engines, Issue MM-265-G, and I have no idea what other models, if any, would share the same clutch instructions, but here goes.... "The clutch furnished with these models of engines is of the disc type running in oil. Use the same grade of oil in the clutch as is used in the crankcase of the engine. The oil should be filled through the inspection plate opening, to the height of the level plug. Approximately a pint of oil is required." Engine oil recommendations...
Spring, Summer, or Fall +120F to +40F... SAE30
Winter...
+40F to +15F.... SAE 20-20W
+15F to 0F..... SAE 10W
Below Zero..... SAE 5W-20W Use oils classifed as Service MS I don't claim to know what the above would be in today's oils, but there you have it from the original Wisconsin book. The book states Rockford clutches were used, and that there should be an instruction plate with oil directions on the clutch.
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