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synthetic oil suggestions

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The benefits of synthetic lubes are many. Superior wear protection, increased horsepower, cooler running engines, reduced deposits, reduced oil consumption, resistance to oxidation and breakdown, easier winter starts - they all add up to a better running, longer lasting vehicle.



Synthetic oils are frequently made from higly refined petroleum base stocks (VHVI and XHVI hydrocracked oils). So, the fully synthetic or 100% synthetic oils are very rare. In fact, most of the synthetic oils are petroleum based (mineral) oils.



As to the Viscosity (weight as you state) most Diesel engines should use 15W-40 for most temperatures. However, the SAE 30 grades are gaining in popularity, and will provide better fuel economy.



What HP gains? There have been studies that show an increase in HP, but generaly speaking, your not going to feel a lot of HP gain, but you will feel a smoother running Engine. :)



Wayne



The wikipedia article you linked also states, "Some tests[citation needed] have shown that fully synthetic oil is superior to conventional oil in many respects, providing better engine protection, performance, and better flow in cold starts than petroleum-based motor oil. However, a test by Consumer Reports showed that taxi-cabs exhibited the same amount of engine wear regardless of which oil was used. "



The only true benefit to synthetics I have found is in their cold flow properties. We have a John Deere 4440 with over 11000 hours on the clock on Delo 400. If Amsoil was so superior, Cummins, John Deere, CAT among others would surely recommend it. Why is it they don't?
 
Briggs & Stratton recommends synthetic in all their aircooled engines, due to its superior high temperature performance.



Oh, wait, this thread is about big turbocharged, water cooled diesels.



Draw your own conclusions.
 
Walmart has mobile one 5-40 Synthetic diesel oil and it's CI plus 4 not the newer CJ oil. Not cheap though, $24 a gallon Shell Rotella 5-40 synthetic when they have it for $19. 99 a gal.
 
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