My only concern would be composition of engine oil. It has lots of additional elements in it for, cleaning, hydrocarbon resistance etc etc. Parts made for engine internals take this composition into consideration, ie rubbers used will be resistant.
I dont know the answer, but is this true of the bike fork internals?
Having build many many many custom motorbikes in my career, fork, engine, gearbox, autobox etc etc oils are all different with differing additives.
I'm not saying dont do it, but I would proceed with caution as go the longterm effect on parts.
Also, surely, your trying to guess a correct viscosity, if mixing oils?
Buying a product specific to the application has to be advantageous ....yes?
I dont know the answer, but is this true of the bike fork internals?
Having build many many many custom motorbikes in my career, fork, engine, gearbox, autobox etc etc oils are all different with differing additives.
I'm not saying dont do it, but I would proceed with caution as go the longterm effect on parts.
Also, surely, your trying to guess a correct viscosity, if mixing oils?
Buying a product specific to the application has to be advantageous ....yes?