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I've just got my hands on an old mechanical hammer. All the main bearings are fitted with grease nipples. On a different, and very very old hammer, all the main bearings were fitted with wick oilers/cups. Grease always seemed to me a nice thing to catch and trap dust, grit, soot and other nasties. Is there consensus on whether oil or grease is better on particular bearings? Or all? The late, great G. Sarver says, somewhere on these forums, 30wt oil for everything, and he was a man who new what he was about. Your thoughts, hints, tips…?