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G'day Ponders,
The dried grease on the shaft does look very old - re-greased two years ago? I doubt it! Grease takes quite some time to get that hard. That type of hard grease residue can occur on wheel bearings subject to water ingress (eg car wheel bearings, but they involve the heat factor was well).
Read the Mobil One PDS - one very important characteristic - it resists "water washout"!
However when you apply just a smear of grease as has been discussed, there will be a very small "reservoir" of oil in the grease applied, so clay based greases such as wheel bearing grease will dry out prematurely.
Have you tried acetone to soften the residue? I'd be reluctant to get too heavy handed with wet and dry paper as you may do permanent injury to the close tolerance components.
So back on the synthetic grease - remember in operation this stuff spreads easily, so use "just a smear". I doubt Mobil One Grease will ever dry out, but use too much and it will sure leak out!
Hope that helps,
David
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