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When I was with M3adjuster when he took his ED delivery of his 1M... the SA at the BMW Welt told us that one SHOULD let the engine cool down when you have been pushing it on the highway/autobahn. He said it only takes a couple of WOT runs before the exhaust is glowing red hot. Its best to let the engine idle for a min or two - to let the oil temps stabilize. I let my engine cool down running any time I been getting on the gas hard - before shutting things down.
And btw... the turbos are oil AND water cooled. Coolant flows via the electric water pump (electronically) when you switch off the engine and the under hood temps(at the turbos) are too high.
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