I just purchased a new Mazda CX 5 with the 2.5L turbocharged engine. The manual says that after sustained high speeds, as in just getting off the freeway that you should idle the engine for about 30 seconds before shutting it down or it may damage the turbocharger. Is this to prevent coking ?
If I drive a mile or two through residential areas at speeds of 35-40 MPH after a freeway run and then stop and shut down the engine, is that sufficient to cool down the turbo ? I can't imagine too many scenarios where I would get off the freeway after doing 75 MPH for several miles and then pull over and park and shut off the engine. My commute to and from work involves a couple of miles of surface streets with some stop & go for stop signs or traffic lights before parking.
If I drive a mile or two through residential areas at speeds of 35-40 MPH after a freeway run and then stop and shut down the engine, is that sufficient to cool down the turbo ? I can't imagine too many scenarios where I would get off the freeway after doing 75 MPH for several miles and then pull over and park and shut off the engine. My commute to and from work involves a couple of miles of surface streets with some stop & go for stop signs or traffic lights before parking.