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Garden Tractors Discussion Forum

Re: oil change for cub cadet 122

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Tom Arnold

11-30-2012 11:38:33

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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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ken combs

11-30-2012 15:17:02

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 Re: oil change for cub cadet 122 in reply to Tom Arnold, 11-30-2012 11:38:33  
My take on the difference: The viscosity modifiers make it behave as a 30 weight at the bearing crank interface under load and shear. But, the ring to cylinder is a different situation, as there is no load, just a sliding interface with no real 'squishing' load. The applications are totally different and the thinner base 'leaks' by the rings at a higher rate.

In the early days of multiweight, I worked in a service station and later was involved in a lot of engine repair.
All my customers experienced higher oil consumption with multiweights. Usually they would burn no oil in the first 1000 mile, then in the next 1000 burn a quart. If it wasn't changed at that point, consumption would increase so that from 2500 to 3000 it would burn full quart.
That's mostly Phillips Trop Arctic, as they were one of the early makers and local to me. So lots of it sold here.

That's my story and I'm stickin' to it.

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