[SEL] Valve Facing Grinder Coolant Fluid

[FRM8198 at aol.com]

I finished building my roll around table for my newly acquired  Black & 
Decker valve face grinder with coolant pump.  Since I  don't have the instruction 
book for it, I need to know what kind of coolant  fluid to use.  I have been 
told that soluble oil or Marvel Mystery oil can  be used.  Anyone have the 
correct answer or is a matter of personal choice?   

Francis Maciel
Santa Maria, CA