I use 10w 30 in the winter. Been using that for a long time and never had any bug fogger problems. I use 15w40 Rotella in the summer with no problems. Kohler manual has the specs for what oil to use in different climates. If you keep it in a heated garage 30w would be ok.
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1641, 1541, 682 with 18hp command engine and hydraulics from a 782. 1872 with a power angle blade.
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