why am i using oil and anti-freeze, but there's no smell or leak on 1999 Jeep Grand Cherokee

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I go through a bit of both relatively often, but like I said, no smell at all, no observable leaks anywhere.
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Most likely cause is your head gasket has gone bad and antifreeze is mixing in with the oil. Due to this leak, it causes the two to burn off in the engine. Check the exhaust pipe after vechicle is warmed up. If you are getting a very whitish smoke that is usually a telltale sign.