Hi, we are using Shell Tellus 100 for a rotary bearing / friction device. After only several thousand revs at approx 20 rpm the performance of the device changes. We have noticed a brown, thin possibly sludgy deposit on the surfaces. This wipes off easlily. We believe this could well be affecting the performance due to a change in the frictional characteristics etc., Can anyone give an explanation as to what this could be ?
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