I have a 2005 Cooper and it's recently been in for the sump and rocker cover gaskets changing under warranty as it was leaking tiny amounts of oil.
Since it's been in for this work i've been able to hear a quiet hissing when the car is idling and in the lower rev range, it goes away after about 3k revs and then totally disappears after 15 minutes of driving.
Now am I worrying for no reason and its just a coincidence thing because of cold weather, or could it be something else?
It's obvious that your car is leaking something and it's not a big deal if you didn't feel anything while driving. I'll go for diagnose check if the engine management detect a problem about it. Most probably there is a little mistake on installing your parts. Get it fixed tho :P Drive your car perfectly
My best guess would be that they have forgotten to reconnect one of the EVAP purge solenoid pipes, a little black plastic valve above the alternator that should have a pipe going in the top and bottom of it.
Or one of the two breather hoses going into the rocker cover.
Please tell us what they found when you get it fixed, thanks.
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