I can't see it having any detrimental effect at all in a gearbox. I would be a little cautious about it in any electrical equipment, and definitely do not use it on the internals of any fuel injection equipment. I can also see it causing issues with piston ring sealing if used on cylinder bores, and for similar concerns on the inside of any hydraulics (including auto boxes). In an engine, it could result in the formation of gums, so probably better not in the internals of an engine.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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