Guidance summary
Let the turbo engine return to idle before shutdown
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Do not switch a turbocharged engine off while it is racing. Let it return to idle and follow any specific cooling period in its handbook before shutting down. The cited manufacturer warns that high-speed shutdown removes oil supply while the turbo still turns; it does not prescribe a universal extra minute of idling for every vehicle or every stop.
Source: Let the turbo engine return to idle before shutdown
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