Re: viscosity

Posted by Jay (ND) on August 13, 2005 at 10:20:51 from (66.231.118.61):

In Reply to: Re: viscosity posted by Oliver Power on August 13, 2005 at 06:56:10:

Yes - that's correct. And while most hydraulic fluids will be a multi-weight, they all start out as 10w and are additived to make them 10w30, etc. Simply put, the additive which makes them a multi-weight is like a curly noodle. When the oil is cold it's like the noodle is dry, and the additive doesn't expand/take up much room. As the oil warms up, it's like the noodle when done, it takes up more room, makes the oil thicker, thus changing the viscosity. But also because of this property, the additive will shear, or eventually break down and eventually, if ran long enough, turn it back into 10w even when warm. No one runs there oil this long, but hypothetically this is what would happen if you did.

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