quote:
Originally posted by BTW574:
I just bought a 03 EB expedition it has the 5.4 in it. Looking through the manual it recommends 5w-20 that mets Fords wss-m2c153-h spec. My other ford list 5w-30 for it and it is only 2 years older.
What is this spec.
I use 5w-30 Mobil1 in my other ford and they do not make a 5w-20.
Seeing that the manual only states that 5w-20 is recommended wouldn't any oil that meets this ford spec be fine to use.
IS it only 5w-20 that meet this spec or is there a 5w-30 or other oil that meets this spec of Fords
Ford owner's manuals state in bold letters, "SAE 5W-20 oil provides optimum fuel economy and durability performance meeting all requirements for your vehicle's engine.
According to Mike Riley, product design engineer with Ford Motor Company, "Moving to 5W-20 was driven by using best technology oils, CAFE requirements and customer needs." The company believes the switch to lighte viscosity 5W-20 oils will reduce carbon dioxide emissions by 190,000 metric tons a year and reduce U.S. fuel consumption by over 21 million gallons a year.
In order to ensure lighter viscosity 5W-20 oils don't sacrifice engine durability, Ford ran extensive field tests comparing 5W-20 and 5W-30 oils and used the data to create their own oil specification known as WSS-M2C153-H, which includes all ILSAC (GF-3) requirements, as well as a longer ASTM Sequence III Test
That's directly from the Amsoil site.
Basically, 5w-20 was driven by the desire to increase CAFE (corporate average fuel economy).
I have no doubt Ford did extensive tests on the 5w-20 to prove it could lubricate properly, but there's no reason you can't run 5w-30.
Except...just run 5w-20 till your engine warranty expires.
