Straight 30W oil is made from 30 weight base stock. 10W30 is made from 10 weight base stock that has modifiers added to make it "behave" like a 30 weight once it reaches a certain temperature. They are two different oils in spite of what the multi-grade label implies.
Kohler's own Op Manual for the K engines says:
"Straight 30-weight oil is preferred. SAE IOW-30 oil is not recommended above 32F. Using this oil substantially increases oil consumption and combustion chamber deposits."
So... if Kohler themselves have warned about "substantial increases in oil consumption" above 32 F, then logically there will be an increased oil consumption in temps below 32 F. The only thing worse than dirty oil is...... not enough oil. That is why I posted the warning. Better to check the oil more often than to watch the con rod fly out the side of the block.
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