My new P/U is a Chev 4.8L. The warranty requires some fancy named oil that GM markets. Nobody will admit to it but I am betting it's at least synthetic blend. So I just go one step farther and use Mobil1 0w-30 since it exceeds the warranty requirements of the funny named 5w-30 required. But I still only change it once a year.
For what it's worth I know their ATF is pure syn and their diff. oil is too. Nowhere in the owners manual is ANY mention of changing either for the life of the maintenance record which I think is 150,000 miles.
However, I live in the country, every trip is at least 7 miles, I drive about 6000 miles per year, don't sit in traffic or pull heavy trailers very often and all that so really I fit in the once per year or 7500 mile upper limits of todays warranties with the better lubricants we have.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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