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Thats what is known as,, rod knock , have the oil pressure checked, the knock sensor may have failed, the cylinder may not be firing,

continued operation will lead to serious engine failure, the crankshaft could break or a rod may break and fly through the engine block.

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try using a heavier oil if the vehicle is higher in milage 10/40 should free up the valve springs they are probrably gummed up 40 weight has a high detergent which wll clean it out pretty well if it persist you might wanty to look into the internals

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