Originally Posted by stephen41987
I've been running MY13 V6 with 10,000 mile intervals. Big difference is the oil you use. Before I could get synthetic Pennzoil 5w-20 I used Valvoline synthetic. It would only make it to about 7000 miles before the computer would tell me to change the oil. Even when I change my oil at 10,000 it still doesn't look as dirty as it should.
The car has no idea what oil you put in it. The OCI indicator is based on throttle input, load, operating and ambient temperatures, plus some other odds n ends. Synthetic or non has no bearing on the interval as far as the OBC is concerned.
Also, a visual observation (dirty, clean) doesn't mean the oil is of any particular condition.
Originally Posted by f1anatic
No. What I am saying is that whatever engine running time cars have from the factory (test track and/or dyno time) will not be sufficient to wear out all the debris, impurities and imperfections from the manufacturing process.
There is no dyno or track time on any new car we can afford. Anyway, sure there is some gear mating and a tiny bit of ring seating but todays engines are not built in barns. It's not like there are CNC shavings sitting in the valve train. Most contaminants are from the casting process but get easily trapped by the filter.
I also change new engine oil early, but after that per the FSM. Considering the big diesels go 20k on one change and the oil is within spec...