200 miles on my new motor, so i go to change the oil. runny and green.... coolant resorvoir empty. why why why? i give up. help.

Damn...that sucks.....do you not know what happened??? Is this your old rebuilt or a completely new engine??

no idea what happened... new motor...

Well if it's new, is it under warranty? Most rebuilt and new engines come with some sort of warranty! I'm sure a major internal coolant leak is covered!

bought from gm surplus store... they auctioned some surplus reman units on ebay...no warranty if bought through ebay. i bought through ebay.

When you filled up the radiator did you use the coolant supplement.

for sure... two tubes bars gold seal powder

Man no warrenty??? But were you told you were buying a in working order or good product. Because if you were told it was in new or like new order and they sent you a destroyed engine you have the legal right to sue them. And im pretty sure ebay backs you up to a certain percentage too. All I can say is check all you fluid lines and if that isnt the case follow through legally.

It could be your radiator if your caddy has oil cooler lines hooked up to it.

the radiator that's in that car has about 10k miles on it. i bought a new one when i first got the car.

hate to say it, but if water went into the oil, then the company who re-built the motor may not have torqued the heads and associated water passage areas correctly, therefore causing a head gasket sealing problem or whatnot. i would first do a compression test on the motor, that way you will be able to tell if it is a head gasket leak or not. if that checks ok, then look into the radiator, maybe there is a leak in the oil-cooler core. hopefully everything will be okay. good luck bro, illuminaP.