I have a 2003 Infiniti G35 with 6,700 miles (weekend only car). I've searched the forum and it appears that the Nissan VQ35DE engine does well on GC, but I've also been told to stick with dino oil (currently Castrol GTX 5W30) until ~12,000 miles. I know that a Blackstone analysis would tell me a great deal about the amount of break-in metals present, but does anyone know if the caveat to stick with dino until 12K is an old wives tale or good advice? Also, since I drive this car so few miles per month, I wonder if I should schedule my OCIs based on time rather than mileage. Thanks for your help.