There is a thread going on over at srtforums where someone mentioned they wanted to try 0w20 to get some better MPG's. Would this be a smart thing to do, or with this viscosity be enough to protect against wear and tear? the motor is a 2.4L DOHC Turbo. Redline is 6200 RPM. Stock power is ~230hp to the wheels. Turbo is oil and coolant cooled. There is an oil to coolant heat exchanger and the stock t-stat is 195. I normally see 195-220 degree oil temps during daily driving and short burst of spirited driving using 0w30. thoughts?