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It is the job of the Head Gasket to make sure that none of these respective parties: Engine Oil/âSharksâ, Coolant/âJetsâ, and air, fuel and exhaust/ârest of the partyâ ever mix with each other. When the head gasket leaks or fails â then one or more of these elements can mix â which leads to a myriad of issues. Here are a few examples: Low combustion pressure â poor performance. Exhaust gets into the coolant â leads to overheating. Coolant gets into the oil â poor lubrication and possible engine damage.
A coolant leak can come from: 1. cracked radiator 2. cracked coolant hose 3. cracked heater coil 4. cracked engine head The first 3 are easy to fix, and doesnt require too much technical knowledge.eport Abuse. First, you bought a BMW. If you have to worry about how much a coolant leak or minor coolant repair is going to cost; get rid of the BMW and buy a car you can afford!