Originally Posted by Javier

I have sent the oil out for tests at 7k, 10k, 15k, and 20k. I have always used Mobil 1 synthetic with Nissan OEM filters. On my parent graves , I have a 8 qt. Capacity with JW oil pan spacer and G-Plus oil cooler without fan. You will be surprised at the viscosity of the oil at these milage points. My car has 159k and I loose only half a pint of oil at 15k. These days the oils are so good that even some new cars now suggest oil replacement between 10k and 15k. Of course if you get on it a lot, would do it sooner. I'm a mechanical engineer not a rocket scientist, but the numbers don't lie. My compression is a smi get below factory specs on the high side. This is an amazing engine!!!