Here is the latest report on our '00 Honda Accord 3.0L V6. This is a 19 month, 6,800 mile run on a mix of 4 qts SM Castol GTX and one qt Castrol Syntec, both 5W30. You will see three of the four previous UOAs on the oil mixture. I had planned to run this out to two full years and up to 7500 miles, but I needed to do some other service work, so I did this too. I think I could have easily reached that mark.