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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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