Interesting... For 2016 Ford recommends 5w30 for all gas engines in the superduty. The 6.2L V8 and 6.8L V10. Up until this year they have been recommending 5w-20 for both engines... So why the change after multiple years of both engines on 5w-20?
separate castings, machined to fit. Sometimes they are different steels to better suit the use. Long wear cast iron for the cylinders, steel for the caps.
Originally Posted By: advocate
Interesting... For 2016 Ford recommends 5w30 for all gas engines in the superduty. The 6.2L V8 and 6.8L V10. Up until this year they have been recommending 5w-20 for both engines... So why the change after multiple years of both engines on 5w-20?
I won't say this as intelligently as it should be said, but:
This kind of goes along with the 5w20 vs 5w50 in the Mustang's 5.0. Perhaps the cushioning layer and heat resistance of 5w20 was found to be a little thin for the HD applications. This is suggested by posts from some lubrication experts on here about the chemistry/hydrodynamics/etc differences between the different thicknesses.
Ford's engineers probably did some testing and noticed increased wear in some places that was reduced or eliminated with the 30 weight. Kind of makes you wonder if they'll test 40 weights....
30w oils seem to be more the de facto standard nowadays. Some are going up to 30w from 20w and others are dropping from 40w to 30w. Makes it very nice. I can use pretty much the same grade oil across the spectrum.
Up till now, CAFE stuff did not apply to class 2 or higher trucks. That is all changing. Even the Class 8 semi trucks are coming under scrutiny by the gooberment for mpg improvements. They are changing the oil classifications for those applications as a result.
Originally Posted By: NHGUY
Maybe that's the new trend....thicker,not thinner.
The 5w30's seem to be getting slightly thicker since SN became the spec.
It seems viscosity went from the low 10's to the upper 10's and low 11's @ 100*C since the latest spec. came about.
Sooooo is this a Ford problem or are we going to see other manufacturers start doing this? Im thinking this is isolated to Ford. Ford has changed oil viscosity recommendations on its engines more than any manufacturer i can think of. Not knocking on Ford or anytbing.
Heres a thought, maybe ford uses 5w-20 for cafe purposes and then later releases a service bulletin stating that 5w30 is recommended and they dont have to retest their engines with 5w30 to comply with cafe standards?
Needless to say, i wonder if Ford will state why they recommend these new changes. Kinda scary, because it will start a war between 5w-20 vs 5w30 again...
That's extremely interesting. I've had three 6.2L Super Dutys. One is a 2011 with 160,000 miles. Always had Motorcraft synthetic blend 5W-20 & it still runs excellent. The 2012 has always had 5W-20 as well. No oil related issues, or any issues at all. I honestly hope they back spec our trucks to 5w30, I'll gladly use it. A thicker oil during heavy towing is never a bad thing.