I use Penzoil ultra platinum oil with K and N oil filter I change it at 8000k
My dealer ship say the oil capacity it 3.3 litres not 3.5 as heard on this thread. This combantion has kept the oil nice and amber coloured even at the time of change. My car is at 22000k on it and at the next change I am going to send the oil in for analysis as I want to keep this car past 400k