2006 Caravan 4L at 70000 miles no oil usage tail pipe gray, no residue, now 101000 miles uses 2+ qt between changes, tailpipe black & sooty
Could be any number of things, Crankcase ventilation system could cause some oil consumption if it is not breathing properly, at that age the valve stem seals can be getting hard so they leak oil, rings can be showing wear by now. Do you notice any blue smoke when first starting it or if it has been sitting for a few hours, going down a hill under fully closed throttle is another way to see blue smoke. A quick code scan can be done at any parts store that does them, usually for free, that could tell you if you have any engine management systems at fault.
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