[jmatta]

I re-filled my '02 S with Porsche OEM coolant when I swapped out the factory t-stat, for the LN low temp stat a couple years back. At the time, the coolant was still original and had traveled approx 15k miles. My coolant and oil temps are considerably lower, which translates to longer engine life. I change my oil once a year at approx 2500 to 3000 miles, so I don't care if I'm not completely burning off contaminants by over-cooking the engine, though I rarely drive the car on short trips and always be certain to get it up to operating temp.

Cost cutting on coolant and oil is nonsense, when you look at the big picture.