raleighnut
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All oil comes from a vegetable/plant source, just because its been buried in the ground for a while (admittedly a looong while) doesn't mean its not organic in origin and the best oil for lubricity and film strength is actually Castor Oil.I think chainsaw oil is vegetable oil; it's supposed to be biodegradeable and it doesn't need to do its job for more than a brief moment before being flung off, which is why it is constantly fed to the chain by a very low geared pump and galleries in the chain bar. As such it's quite a viscous sticky oil and I would expect it to collect dirt - it certainly holds sawdust around the working parts of the chainsaw, building it up into a horrible sawdust slush. Bike chain lube on the other hand is AFAIK a wax dissolved in a volatile solvent, which carries the wax into the links then evaporates leaving a dryish chain.
As for chainsaws the pump is set up to provide maximum lubrication in temperatures far below freezing and all quality chainsaws have an oil flow adjuster screw (left off on cheaper models) to regulate the oil flow. (mind you that is one chain that you don't want to be around if it should snap)