Why is blue smoke coming from my exhaust?

Blue (or blue-gray) smoke means the engine is burning oil. Common causes: worn valve seals letting oil drip down into the cylinder when parked (smoke on startup that clears up), worn piston rings (smoke under acceleration), or a stuck PCV valve forcing oil into the intake. Check your oil level — if you're adding more than a quart between changes, you've confirmed oil consumption.

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