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Got a 2000 Saab 95 with the same engine as the Catera. I have a leak in my oil cooler. Thought it might be a head gasket but I realized this engine has an oil cooler and these things always go bad. Took out the oil cooler (very difficult w/ turbo engine)and low and behold, leak. Symptoms engine runs great. No loss of coolant. No odd smells. Just oil in coolant reservoir. Hard to bypass. Would if I could.