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If you have antifreeze coming out of your oil pan you're in trouble.

Knock comes from poorly combusting gas/air mixture in the cylinders. Engines need oil to lubricate the pistons moving in the cylinders and the crankshaft, gears and mechanisms controlling the valves. If you have antifreeze coming out of your oil pan, that probably means you have a cracked engine block because antifreeze circulates in the cooling system, which is supposed to be entirely separate from the oil circulating. More likely is that the antifreeze is leaking out of one of the pipes or hoses, especially at connecting points, and dribbling down the side of the engine to the oil pan at the bottom of the engine, and it just looks like it has come out there. If the engine loudly knocks all the time it may be a thrown rod.

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Q: Motor leaks antifreeze out of front of oil pan motor knocks?
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