Originally Posted by BillBoost37
You can move out the change interval as mentioned. However... the manufacturer interval is about 4500-6000 miles from the factory.
I'm not looking to create a debate in your thread.. my personal opinion is..change it every 3K because the dirt and grime is still in the engine and oil.
Synthetic doesn't break down like dino and has a few more detergents...that slows sludging. By extending the change interval..IMO you will still expect and have some sluding. When changing mine every 3K..I noticed a cleansing effect.
Not so Bil, For the all aluminum N* engine, The oil life monitor is set for 9000 miles. But the software involved varies it a bit. After my initial change out at 1000 miles, the second one was done at 9400 miles (8400 on oil) with 15% life left still showing on the oil life monitor. The third change is due with the monitor showing 9% life left at 18,000 miles. Which puts 8600 miles on the second change. I used Castrol Syntec for both changes. Use your oil monitor, its, there for reference, OnStar uses it to tell you when to change it, and your warranty covers the engine relying on it. Why waste money?
There is a Great deal of new research on the net showing Synthetic doesnt break down like Dino and that actualy leaving it beyond 5000 miles slows metal content gain in the oil, in otherwards, 5000 miles into using syunthetic,...... the oil is working better for you than when new. It doesnt seem right, but several reports accurately measuring metal content curves bear this out.
Here'* a page bearing this out with Mobil One
Same for Amsoil
Notice most gains in metals and contaminants slow as the oil ages.
For what Synthetic costs, and data available, I'll use my oil monitor and save a few bucks.