Background: I have a 2004 GP that I put heavy mileage on (minimum 600 miles per week) 100% highway driving. I have used the lowest cost on sale 5w30 conventional (it has had everything, Castrol GTX, Shell Formula, etc.) since new with 7500 mile OCIs. The car requires .5 Qt. makeup between changes.
Question: This car is factory equipped with an oil life monitor in the DIC (Driver Information Center), it is nothing fancy just an algorithm based on my driving habits. I stick to the 7500 mile OCI but the monitor consistently lasts out to the 11000 - 12000 mile mark (I don't reset it). Has anyone pushed a Series III this far? I am at the EOL maintenence point in this car now so 11 - 12k changes appeal to me.
Question: This car is factory equipped with an oil life monitor in the DIC (Driver Information Center), it is nothing fancy just an algorithm based on my driving habits. I stick to the 7500 mile OCI but the monitor consistently lasts out to the 11000 - 12000 mile mark (I don't reset it). Has anyone pushed a Series III this far? I am at the EOL maintenence point in this car now so 11 - 12k changes appeal to me.