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Originally Posted by BMW Fanatic
What year's the car? Warranty? If that stuffs still in tact then why you worried bro. Unless you're supercharged or gotta tune to worry about.
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Piston rings are a decently cheap fix. Cracked block is more expensive but very unlikely. I bet its not so bad. A lot of little leaky things or worn things can cause this. My bet is on the piston rings or seals. good luck!