WC>> Frozen oil would be many times more viscous and so plug the
 WC>> pipe.

 RC> Does oil really freeze given the various properties of its various
 RC> components?

 BA> Yes.  The German Army discovered that during WWII.  Of course, it
 BA> depends on the specific composition of the oil, but the ordinary
 BA> oil in internal combustion engines did in fact freeze during the 
 BA> coldest parts of the winter on the Soviet front.

not only that, but there is a reason why those in the extremely cold
climates keep their engines running 24x7 even when they are doing any
work... some also have the capability of keeping their fuel tanks and fuel
lines warm... the show "Ice Road Truckers" has shown what happens
several times... i've also seen it talked about in shows concerning
drilling operations in those extremely cold climates...

)\/(ark