May indicate a blowby condition. Keep an eye on it. If you feel so inclined, check the compression and do a leakdown test. If it's a small amount, just keep an eye. You could also change the air filter element, if it's dirty.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.