I took my car, a '95 Buick Regal Custom with approx 68,000 miles on it, into the shop yesterday, because the "service soon" and "low coolant" lights were coming on. the mechanic said I had oil and coolant mixing together in my intake manifold,and that it would cost $1250 to repair, which is about what my car is worth. what I want to know is: 1. is this a reasonable cost for this kind of repair? or should I take it to another shop? 2. should I pay for the repair and keep driving my car, knowing that it may continue breaking down over time? I've already sunk some money into it for other repairs, and I don't think it's gonna get better over time.

thanks in advance for any thoughts or advice. I appreciate the input. feel free to ask questions if you need more clarification on anything.