Superior machining and running the engine at 198° is the reason the OEM today lasts 150,000 plus miles. Back in the '70's an engine was ready for overhaul at 80K. Today the OEM uses superior machines and runs engines at 198°. Personally I feel the temperature is the number one single reason cars run so much longer these days. But........if the machining was not updated, the improvement with temp wouldn't hold water.