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i read a guy back who was using much heavier oils in clocks and watches to see what would happen, he said it made no difference to the running and no difference to the wear rate as far as he could tell. I know lubrication is one of the most important aspects of horology but I do wonder what the sound reasoning behind using light oils is when you hear stories about 3 in 1 and wd40 being used and not causing any real problems. This does in no way mean I will use them on a clock but it does make me wonder!