Greetings,
For anyone interested in changing their own oil here is a tip on the oil filter for the 3.5 engine in a 2002 I35. (Should be the same on a G35)Use part number 15208-9E000 for the larger, original equipment filter shipped with the car. The replacement oil filter is a smaller filter, part #15208-65F00. I want the biggest oil filter I can get. I'll be switching the oil over to 5-30 Mobil One at the next oil change. I'll report any improvement in mileage. Best reading to date (after three weeks of driving) is 25.4 MPG during one trip of 279 miles. Some of that was city, most was highway.
Regards,