- Joined
 - Aug 6, 2007
 
- Messages
 - 1,422
 
- Points
 - 3,101
 
- City
 - Sacramento, CA
 
- Vehicle Year
 - 2007
 
- Engine
 - 2.3 (4 Cylinder)
 
- Transmission
 - Manual
 
Ford "back-specified" 5W-20 for many older models later. That's why the oil change places are telling you they plan to use that grade. Ford's change was about "fuel economy".I'm with you about sticking with higher viscosity. 20W-50 might be overkill if it isn't using/losing oil, but 10W-40 shouldn't hurt anything.
My 4.0 takes 5W-30. No way am I going with xW-20.
The 4.0 uses 5w30 due to the design of the oil pump and it's inability to maintain adequate oil pressure at operating temperature using 5w20. That engine design comes from a V4 designed in the early 60s. It's big, fat, inefficient, and clunky when compared to the newer engines. Don't compare it to the engines in modern vehicles. It's summer now, so a 20w doesn't matter. A 50 weight is excessive. 5w20 or 5w30 is more than adequate. There's much more to engine lubrication than the weight of the oil. You not only want the oil to maintain a film between moving parts. You also want it to flow between the parts to cool the bearing surfaces and be able to reach all the components in the valvetrain.
	