Originally Posted By: JustN89
I mean, he doesn't provide any facts to support the 5-7k mile intervals, he just provides his opinion and says that by doing so, you'll keep the engine nice and clean. That's fine and all, but the end goal isn't cleanliness as much as it is getting the most out of your engine and engine oil. There's plenty of evidence on this board that points to getting more out of Pennzoil Platinum than just 7k miles. Just my opinion though.
Maybe ... To some folks who know they will have to get into an overhaul down the road, a clean engine is a good thing. To others who live in the rust belt and will have to get a replacement car/truck before the engine dies, it's not such a big issue.
One family truck we had went over 4000,000 miles with periodic work. No rust. Just wear. I'd like to work on clean stuff where I can see the parts ...
State of Cali Fleet Admin ran extensive tests across their BIG fleet (60,000 vehicles) and determined that the bottom line is oil changes every 6,000 and filters every other change. That results in best longevity, fewest repairs, and highest resale value (auction). Seems reasonable to me
Now, if you have by-pass filtration - that's a whole nuther ball game