How often to change oil?

[armandodiaz]

I've called 4 Porsche dealers in Florida. They all use only M1 0W-40. They have stated, they have been instructed by Porsche to only use this weight.
As far as intervals, I change mine every 5K. Mainly cause its easier to keep track of oil change intervals. If I had to, I wouldn't go any more than 7.5K.