Originally Posted by Barnone
Take a sample of your oil at 5k miles and send it off for an analysis at a place like http://www.blackstone-labs.com/?gcli...FRCenAodtRKK3g
Otherwise you are just guessing and probably wasting oil and money.
Any good dino much less the syn oil should be good for at least 5k. If the oil is "worn out" at 5k then you probably have engine problems which the oil test should help you determine the problem.
Thanks, I think that I might do just this.
I used to run a full-synthetic by "Conklin" as a fellow I knew at the time sold their product. After 12k miles, the oil tested fine on his personal tester. Unfortunately, I don't know what it was testing for, but I assume there was some validity to it. I should also mention that my vehicle at the time was a '77 Ford F150, so a little bit different of a beast from today's technology.
That being said, it was a different brand of oil in a different vehicle, in different driving conditions... almost nothing can be held constant between the two scenarios. It did, however, open my eyes to the capabilities of synthetic lubricants. It does seem when I ask around locally that I'm one of the only people running oils as long as I do, which tends to concern me a bit... I was very curious what some of you are doing, and if any known issues have come of extended-mileage oil changes with synthetics.