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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
1. oil in the coolant (floats on top where you can see it)
2. coolant in the oil (sinks to bottom where you cannot easily see it)
3. unequal compression
4. poor idle
5. power loss
I'm sorry to say I agree with your diagnosis, based on #1.