The turbo on your petrol engine is watercooled, but the engine and the turbo spin faster than a non-watercooled diesel turbo. So you need to allow the engine to idle or run at less than 1500rpm after a long ascent, after towing, after spirited high rev driving, and after constant speed on the motorway, for example when stopping for fuel. Just leave it idling for 30-60 seconds before switching it off. At the end of slower journeys where the revs are low, there’s no need.