Lugging the engine in the higher gear is bad for all kinds of engines. I witnessed this system first hand in the BMW M3 F80. So, even when you shut the engine off, the oil keeps flowing through the turbochargers for a few minutes. Some newer cars, however, comes fitted with a system that continues to turbo cool down procedure even when the engine is shut off suddenly. All this ultimately increases the wear due to lack of lubrication. Over time, this may lead to harder to spool turbo, obstruction in oil line. When the engine is shut off without following the cool down procedure, the oil that is collected near the turbochargers starts burning and can gunk up the system. It’s also a good habit to drive last few kilometres to your destination sedately. Let the engine idle for a minute or two so that turbos can be cooled by flowing oil. Traditionally, turbochargers are cooled by the engine oil that is fed to the turbo bearings. That’s why you need to cool them down before shutting off the engine. Even if you have been cruising at high speed on the highway, the turbos keep spinning at high rpm and get really hot. Turbochargers can get really hot and can even glow orange with heat when you come back from a spirited drive. Let the turbochargers cool down before turning off the engine This may take around 10 to 20 minutes for your car. Instead, they say that start the engine and drive the car sedately until the engine temperature reaches the optimal operational level. Most modern car manufacturers don’t suggest idling the engine for warming up. This lack of optimal lubrication during the initial 10 to 15 minutes of startup means that engine is most susceptible to wear and tear. You can imagine why it’s important not to floor the throttle when the engine is still cold. The critical areas like crankshaft, piston pins, cam bearings, piston rings, and Turbocharger bearings are deprived of oil, hence lubrication. This is mainly because, in a cold engine, the engine oil gets settled down in the oil pan. This habit is bad not only for turbocharged cars but also for naturally aspirated cars. Most wear and tear to the engine happen due to revving the engine just after the cold engine start. Warm up the engine before putting pedal to the metal When do you need aftermarket blowoff valve?.Do we need to do all this for newer cars also?.Use right engine oil and replace it often.Let the turbochargers cool down before turning off the engine.Warm up the engine before putting pedal to the metal.