My Mini Cooper was doing the same thing i wasn't loosing coolant and my car was dying whenever i made a hard stop so i checked the oil level and it was low so i filled it up and the idle is fine now but i noticed the coolant went down and there was a milky look to the oil a little bit so i have a minor head gasket leak
Let's start by talking about what a head gasket is. The head gasket lives between your engine block and cylinder head. Every modern car has this gasket but they vary in their thickness and construction based on the manufacturer's design of the engine.
The cylinder head is attached to the engine block by numerous bolts or studs.It has several functions. The cylinder head seals the cylinders on the side opposite to the pistons; it contains short ducts (the ports) for intake and exhaust and the associated intake valves that open to let the cylinder be filled with fresh air and exhaust valves that open to allow the combustion gases to escape.
Three Parts:Diagnosing a Head Gasket Leak Draining the Old Coolant Filling the Coolant System with a Sealer Mixture Community Q&A A leaking head gasket can be quite the problem. If you don't want to take your car in for a proper head gasket replacement, you can try fixing it on your own with engine ...