Hi Members,
Thanks Gadge, this is a very good topic. Learning some good pointers here.
Thanks Paul,
*cough* Here I have to declare I'm operating at a 'disadvantage', as compared to some of those who pontificate on some lubrication forums, tho'
not ODK.

As in, being a technically qualified professional [Industrial Chemistry and Chemical Engineering]; with knowledge, interest and professional experience in the fields of Tribology [the science of machine lubrication], lubricant formulation, and used lubricant analysis for diagnosis of excessive wear...
Our Forum Historian CyberJack can confirm this, as he's seen a pic of my study 'certificate wall'...
BTW, NormK may have been referring to the use of used cooking oil as
fuel in a
diesel Enfield bike engine,
not lube oil.
I do know that Enfield India Motorcycles did/do market a model with an industrial air-cooled diesel single-cylinder engine. They must be 'interesting' to ride; given the revs vs power/torque characteristics of this engine type...