New gas vehicle have run the 5w20 oils now for some time.. and yes, they claim a 2 percent increase in fuel economy. However the hd diesel engines are design to run on a thicker oil , accouting for wear, and lowered oil pressure at the far end of the oil journals.... Running a thin oil in an engine with lots of wear is a sure fire way to finish it off.
Newer engines can design around the thinner oils by building larger volume oil pump,, not higher pressure and a bigger relief valve so the cold pressure is controlled better. They can also change the width and design of the bearing surfaces. AND they can see an increase in fuel economy.
I was hoping they would come out with a pre "catalyst" hd diesel oil, higher in zinc and phosphorous... for us older equipment users, as it was the best oil known.. newer oils lowered these additives for the emission systems at the expense of wear on our engines.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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