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Nigel Calder explains that turbocharger cooldown before engine shutdown matters far more than warmup.▶ 1:29 If an engine is shut down immediately after running at wide-open throttle, the turbo continues spinning while red-hot with no fresh oil reaching the bearings; the residual oil carbonizes and destroys the bearings.▶ 0:50 In a typical boating context, slow-speed maneuvering into a slip or while pulling anchor provides the cooldown naturally, so no deliberate idle period is usually needed.▶ 1:19 Warmup is similarly a non-issue: by the time a boat clears the dock or retrieves the anchor, the engine is warm enough to go to full throttle.▶ 1:39 Calder also recommends periodically running the engine at high speed and load to prevent carbon buildup and to exercise the turbo's wastegate — a bypass valve that opens only above a certain RPM threshold and can seize if never actuated, causing further problems.▶ 2:04 The practical rule: normal marina maneuvering handles cooldown automatically, but skippers who never push their engines risk a stuck wastegate.

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