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I'm just adding a small item of information that was missing from this otherwise information-light discussion. I saw no need to inject my opinion, which is already well represented by you and by others. I believe Phuong provided a plot of turbo oil temp vs time after shutdown with and without the oil circulation device. I was not able to relocate that plot in the forum archive, but I printed it and stuck it to my wall some years ago. Based on that chart, I idle my car for at least 2 minutes after a 20 minute track session, but not for more than 10 minutes. According to the chart, 2 minutes was sufficient.
- John

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