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I have a 2005 colorado that I gave recently had to add oil to in between changes ? Truck runs fine no issues but it's useing oil somewhere no leaks , no smoke but today had to add 3 qts? Where could it be going ? I do sometimes get a p0014 code but seems only when when very cold outside.
 

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3qts isn't good as it's ~1/2 your oil. Did you check the coolant to see if there could be an issue w/cracked block? If you're losing that much oil to combustion...there's got to be smoke coming fm somewhere - have someone watch while you rev/run motor...
 
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