Is it necessary or suggested to let the engine run for a few minutes before turning engine off to protect the turbo?. I can remember having a mercury Merkur 20 plus years ago and I had to let that idle for 2 to 3 minutes before shutting it down. My friend also has one of those ford RS focus (45K) and he says that all turbo engines require a cool down or I think he called it a spool down. Should I be doing this in the RDX
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