[Farmall] stuck engine

[Kevin Bish]

Hi to all on the list.
 I am buying a F12 Farmall. The engine is stuck, and has been soaking. The 
guy I am buying it from has tried to free the engine, but has had no luck. 
Anyone have some ideas about what to use? This question has probably been on 
here before, but I just wondered if maybe someone has tried somthing new, 
that loosens things up better than some of the oils suggested before? 
Thanks, Kevin.