My 97 Deville 4.6L with 114k miles has developed major oil leak from the oil pan. I'm told to repair this will require pulling engine which is 11 hrs labor at a cost of $1500+. I am not mechanically inclined and am new to this forum. I am horrifed to learn of all the head casket problems, and the DEX cool issues. My question is whether or not to spend the money and fix the oil problem when bigger problems may be lurking. I really love the car, but resources $$$ are tight right now. Recently had to replace water pump, and air conditioner about two years ago. I assume if there is no antifreeze in my oil then the DEX most likely didn't cause my oil leak problem, but what is a good way to determine if the DEX is reaking havoc on my head gasket, and is it wise to switch to another antifreeze? Any advise for this "rookie" will be greatly appreciated!