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Old 26th May 2019
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I always thought "friction modifiers" was a generalization term they use for the varying additives they put in oil, trans fluid and gear oil, etc. I got this off the www.

Friction Modifiers/ Machinery Lubrication

["The purpose of a friction modifier varies based on the application. In a combustion engine, the goal is to lower the amount of friction, thereby gaining fuel economy. In clutches, automatic transmissions and industrial applications, the aim is not simply to control friction in order to maximize efficiency but to reduce slippage.

To a degree, this seems a bit counterintuitive, since a lubricant’s objective is to reduce friction and wear. However, there are many situations in which a certain amount of traction friction is required for equipment to operate properly. The friction modifiers used in these applications are not intended to increase or decrease friction but to act differently under specific shear conditions.

This essentially smooths the transition from a dynamic condition to a static condition, such as during a gear change in a transmission or the engagement of a clutch."]

Now back to the regularly scheduled thread...............
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