I changed the Water Pump on my 87 190D 2.5 and decided to go to Zerex from the PO's green Prestone. After about 3 days the radiator started to leak where the plastic meets the aluminum core.......OK, must be a its time......Replaced Rad, and it started leaking from Aux Pump and a couple of hose connections.......Hmmmmn, being the genius I am, I am begining to suspect that the New G05 fluid may me the cause......now, I am leaking Anti freeze into my drip pan I use to catch the oil from my leaky rear main seal (ANOTHER bad story). Question 1) Is there something about the Zerex product that can lead to this? 2) If my heater core is leaking, is there a drain that would dump the leaking fluid under the car as opposed to inside? What else could be leaking back there??? Damned puzzled and can't get under it until I am back in town........Any ideas? Thanks Scott