To all Mini Cooper S Owners Important Info about Core Plug Engine Failure. I just purchased a beautiful 2011 Mini Cooper S S56 with the N18 engine. It seemed excellent and drove better than any other Cooper S I tried. My first 100 miles were nothing but smiles! At 101 miles a coil stopped working putting into limp mode home. I have spare coils from my 335i BMW so it was a 2 min fix. Then while testing out a bluetooth gauges set up we got stranded in the Everglades for 3 hours when the Mini decided to go into limp mode. My friend noticed the engine heat on the blue tooth phone gauge go high and we shut the car down. After a $280 tow back home I decided to dig into it and this is what I found! A core plug had popped out allowing the coolant to mix with oil. I will replace the plug using an aluminum bar stock that I cut and trimmed for a tight large hammer fit. I changed the engine oil and coolant a few times and see if there's any more damage. All is fine!
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