Antifreeze compatibility problem...

[orbitalsolutions]

I made a mistake, not sure how much trouble I'm in. To make a long
story short, I have a cooling system in my Bird' that is filled with an
ethylene glyco antifreeze. I topped it off with one gallon of
Catapillar antifreeze, discovering later that the two antifreeze types
are not compatible.

I do not know why they are not compatible. How much trouble am I in?
Do I have to drain all 15 gallons of antifreeze? What will happen if I
just continue to top off with an ethylene glycol product?

Thanks in adance for your help.

--James(nerviously awaiting your replies)
978FC33
Las Vegas NV