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Synthetic Oil
Found this on another forum...FWIW:
"(name deleted) hit the nail squarely on the head. The company I work for has the largest privately owned fleet of vehicles in the world. You can imagine the amount of money we invest in research and development. Our oil is spec'd at 15w40 Delo or equivalent. It goes in everything from a Dodge Caravan to the largest tandem diesel.
Locally, we maintain over 90 OTR tractors. Our oldest trucks, 1995 and 1996 Mack CH612, currently have 1.4M to 1.7M. Most have never been apart and they still run clean and pull hard. This is with a 30K mile oil drop interval. We use an oil spinner in conjunction with the 2 stock filters.
We DO spec full synthetic for manual tranys and diffs as there is a definate payback in terms of component life.
Synthetic's main advantage is viscosity when cold. If using synthetic oil in your crankcase make's you happy, by all means use it. Just don't expect there to be any financial payback at the end of the tunnel. If there was, we would be using it too!"
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