Back in the 90's I had a 300zx twin turbo. A popular upgrade at the time was a "turbo timer", it would keep the engine running for a while after you turned off the key to let oil circulate and cool so the turbo bearings would last longer. Nowadays turbocharged vehicles are common and so are start/stop systems. I was wondering what changed to make the turbos long-lasting with the engine constantly turning off: Oil Quality? Oiling systems? Nothing?