Re: GF-4 Based Oil vs. GF-3 - What is the difference?
> "C. E. White" <firstname.lastname@example.org> wrote in message
> > "Oils tested are now compared to an SAE 5W-30 synthetic
> > reference oil instead of the SAE 20W-30 mineral reference
> > oil used under the old program. Engine oils must achieve
> > 1.1% better fuel economy for SAE 5W-30 motor oils and 0.5%
> > better fuel economy for SAE 10W-30 and SAE 10W-40 motor
> > oils."
> There is some confusion here because neither 10w/30 nor 10w/40 would qualify
> as 'energy conserving' and the 10w/40 would most certainly not achieve
> better fuel efficiency than the reference 5w/30 in any conditions.
Valvoline claims their 10W-30 Synthetic Blend meets the
Energy Conserving requirements
"SAE 10w30: Is the leading consumer grade. Exceeds all car,
light truck, van or sport utility manufacturer's warranty
requirements for the protection of gasoline, and
turbocharged engines where an API SL, SJ, or CF oil is
recommended. Exceeds European ACEA A1 and all requirements
of ILSAC GF-3 for API Gasoline Engine Oils and meets Energy
Mobil also claims their drive clean 10W-30 meets the Energy
I am sure there are many other 10W-30 oils that meet this
standard. It seems obvious to me it should not be a problem,
this fuel efficiency is measured once the oil is at
operating temperature, and at this point, 10W-30 and 5W-30
aren't much different. I looked at the API license list, and
most 10W-30 oils are "energy conserving (see
the ones with the * can be labeled "energy conserving"). You
are right about the 10W-40. I couldn't find anyone
advertising an "energy conserving" 10W-40 motor oil and not
one in the API list was eligible for the "energy conserving"
I did notice one interesting item in looking throught the
lists - Ford of the US sells only API "SL" 5W20 Motor Oil.
Ford of Canada sells both API "SM" and "SL" motor oil. What
gives? Both are claimed to be ILSAC GF-4.