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In summer all I ever run is streight weight. Most all manuals pre 90s tell you this from lawn mowers, to garden tractors to the big stuff like this. Our IH 2500 tells you to use streight 30w in summer. Streight 10w in winter. Im only using multi viscosity in winter where Im going to use 10w-30 instead of the original 10w. - Thin multi viscosity oil LEAKS out of these engines at start up and till engine is HOT! - Reason is very simple. Tractors are not car engines. The tolerences are very loose in comparison. A car has tight rings so less blow by till engine warms, also more snug, often fluted oil rings to wipe cylinders clean on down stroke. Tractors well, when started rings are loose, very loose tolerence in contrast. So oil is left on the cylinder walls, not wiped off, AND the loose fit allows what oil can pass right by the compresion rings, and be burnt with gas in compresion stroke (and exit exhaust) till the rings swell enough to get to spec again and fit cylinder tight. This is exactly why a real old worn engine chugs and may smoke till it warms up, rings are way worn. Its also why you should never tune a carb on a tractor till its fully warmed!
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