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From Shell: #4113913 06/03/16 06:51 AM
Joined: Apr 2007
Posts: 3,289
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dblshock Offline OP
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Many medium and large fleets are ditching 15W-40 heavy duty engine oil
(HDEO) for 10W-30 HDEOs. According to a recent study about 20% of medium
and large fleets are now using 10W-30 HDEO (Power Systems Research, 2014).
The most common reason for the change is the increase in fuel economy by
switching to lower viscosity oil.
1. FUEL ECONOMY IMPROVEMENTS ARE CORRELATED WITH VISCOSITY
Engine oil’s main job is to protect your trucks’ engines. The combustion cycle
creates heat, soot, and acid; all of which the HDEO must mitigate. However,
HDEO also presents the problem that it adds drag to the engines’ movements.
Imagine swimming in honey; it would require a lot of energy to get across the
pool and stay afloat. Swimming through honey is much like what your engine’s
moving parts have to do to move through oil. As you can imagine, the thicker
the oil, the more energy it takes for the engine’s parts to move through it. There
is nothing magic that makes a 10W-30 HDEO more fuel efficient; it is simply
thinner and therefore produces less drag on your engine.
2. DON’T SACRIFICE WEAR PROTECTION FOR FUEL ECONOMY
While the viscosity of an HDEO accounts for its contribution to fuel economy,
it is the composition of the base oil and additives that protect your engine from
wear, soot, and acid. Because 10W-30 is thinner than 15W-40 oil, its film
strength can be weaker and it can be more prone to oxidation. Therefore, high
quality additives are needed to compensate for those weaknesses in order for a
10W-30 engine oil to protect as well and last as long as a 15W-40. High quality
10W-30 oils can perform as well, and better than industry-standard 15W-40 oils.
3. NOT ALL 10W-30 ENGINE OIL IS THE SAME VISCOSITY
The stated viscosity of a HDEO does not represent an exact viscosity, but rather
a viscosity within a range on the SAE viscosity scale. Engine Oil viscosity is measured
in centistokes (cST) at 100°C. “W’ grades are measured at 40°C. 10W-30 engine
oils can fit anywhere in the range of 9.30cST to 12.49cST. Engine oils closer to
9.30cST will provide better fuel economy benefits than oils closer to 12.49cST.
Therefore you could have two separate 10W-30 engine oils produce two different
results in fuel economy. Furthermore, if you are comparing the fuel economy benefits
of a 10W-30 to 15W-40, your results will vary depending on the exact viscosity
of the 15W-40 oil, because the 15W-40 designation represents a range of viscosities.

4. BETTER FUEL ECONOMY DOESN’T NECESSARILY MEAN
YOU’LL BUY LESS FUEL
While this may sound straightforward, many fleets are disappointed when they
switch to 10W-30 HDEO and don’t see a reduction in their fuel purchases. All
things being equal using 10W-30 HDEO requires less fuel than using 15W-40
HDEO. However, all things aren’t equal. Fuel prices fluctuate, routes change,
cargo weights differ, weather never stays steady, and drivers’ behaviors can vary.
The best way to ensure your trucks are getting better fuel economy with 10W-30
HDEO is to develop and maintain a precise method for calculating fuel efficiency.
Don’t just look at your fuel bills to evaluate the fuel economy benefits of switching
to 10W-30 engine oil. One way is to use data from the electronic control module
(ECM) to statistically isolate certain variables and calculate differences in fuel
economy from before and after switching to 10W-30 engine oil and to compare
different trucks. The bottom line is that 10W-30 HDEO produces less drag than
15W-40 HDEO, but sometimes it takes looking below the surface of a fuel invoice
to notice the changes.

5. LOWER VISCOSITY HDEO WILL BECOME THE NEW NORM
New governmental standards for greenhouse gas (GHG) emissions and fuel
economy are adding pressure to engine manufacturers to produce more efficient
engines. Additionally truck, engine, lubricant, and fuel manufacturers are
continuously looking to add value for their customers; one way is to make a
product which allows your customers to use less fuel. Currently a new category
of engine oil is being developed and evaluated by the American Petroleum
Institute (API) in conjunction with the new heavy duty emission standards set by
the EPA that will go into effect 2016. The new engine oils haven’t been given
a specific designation yet (like “CJ-4”), but have been dubbed PC-11 (proposed
category 11). The details of PC-11 haven’t been worked out yet, but industry
changes are forecasting that the majority of heavy duty engine oil will shift from
15W-40 oil to XW-30 (i.e. 0W-30, 5W-30, and or 10W-30). The good news
is that you don’t have to wait for the entire industry to shift to 10W-30 engine oils
to start seeing the fuel economy benefits of 10W-30. Contact your Shell Lubricants
rep today to learn more about taking the plunge to fuel savings.
FOR MORE INFORMATION, CONTACT US
Shell Lubricants’ Technical Information Center: 800.237-8645
[email protected] shell


05 Lexus GX470 167k
640:1 TCW-3
5/30 10/30 5/40 15/40
Michelin Latitude

06 4Runner SR5 150k
640:1 TCW-3
Citgo 10/30 conv XG3614
Falken Wildpeak AT3W
Re: From Shell: [Re: dblshock] #4113915 06/03/16 06:52 AM
Joined: Apr 2007
Posts: 3,289
D
dblshock Offline OP
OP Offline
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Joined: Apr 2007
Posts: 3,289


05 Lexus GX470 167k
640:1 TCW-3
5/30 10/30 5/40 15/40
Michelin Latitude

06 4Runner SR5 150k
640:1 TCW-3
Citgo 10/30 conv XG3614
Falken Wildpeak AT3W
Re: From Shell: [Re: dblshock] #4113946 06/03/16 07:44 AM
Joined: Oct 2010
Posts: 7,467
A
A_Harman Online Content
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Joined: Oct 2010
Posts: 7,467
Originally Posted By: dblshock
“W’ grades are measured at 40°C.


Totally wrong. Someone from Shell actually wrote that?


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: From Shell: [Re: dblshock] #4113954 06/03/16 08:00 AM
Joined: Apr 2007
Posts: 3,289
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dblshock Offline OP
OP Offline
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Joined: Apr 2007
Posts: 3,289
right, all from Shell...looks like what they've done for autos they're going to do for work rigs...they don't factor in the cost of rebuilds though.


05 Lexus GX470 167k
640:1 TCW-3
5/30 10/30 5/40 15/40
Michelin Latitude

06 4Runner SR5 150k
640:1 TCW-3
Citgo 10/30 conv XG3614
Falken Wildpeak AT3W
Re: From Shell: [Re: dblshock] #4113984 06/03/16 08:39 AM
Joined: Jul 2015
Posts: 3,772
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AirgunSavant Offline
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Joined: Jul 2015
Posts: 3,772
I prefer Citgard 700 10w30- Great Stuff!

Re: From Shell: [Re: A_Harman] #4113990 06/03/16 08:45 AM
Joined: Sep 2015
Posts: 2,670
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zeng Offline
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Joined: Sep 2015
Posts: 2,670
Quote:
High quality 10W-30 oils can perform as well, and better than industry-standard 15W-40 oils.


Comparing oranges against apples ... again... in the name of FE and efficiency.... further bolstering their fat margins .... against consumers' wallets. blush

Originally Posted By: A_Harman
Originally Posted By: dblshock
“W’ grades are measured at 40°C.


Totally wrong. Someone from Shell actually wrote that?


Oh .... a case of Bitog's ..... oil blenders and OEM engineers know better than you and me, right?

Re: From Shell: [Re: dblshock] #4114036 06/03/16 09:36 AM
Joined: Jun 2014
Posts: 1,782
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chrisri Offline
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Posts: 1,782
Nothing new really. Trucks in Europe use 5w30 for years now, both full, and low SAPS. On 62k MILES OCI. They all made over 700k at which point they are usually sold to new owners either in eastern Europe/Russia or Africa and Latin America.


02 Nissan Terrano 2.7.TDi Total 5w40
06 FIAT Stilo MW 1.9 Multijet SHU 5w40
07 Opel Vectra SW 1.9 CDTI 150 Motul 5w40
Re: From Shell: [Re: dblshock] #4114107 06/03/16 10:40 AM
Joined: Sep 2015
Posts: 6,213
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BrocLuno Offline
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I think Chevron's Delo SD 15W-30 may be a better choice for older engines. Less VII's and a thicker 30 tending toward the 40 side smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: From Shell: [Re: dblshock] #4114521 06/03/16 08:23 PM
Joined: Feb 2016
Posts: 475
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claluja Offline
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My 2014 F250 6.7L gets significantly better mpg with 10w-30, than with 15w-40 or 5w-40. However, manual says don't use 10w-30 for towing or with bio fuel. I tow, so I don't use it anymore. But the difference is noticeable at least in my truck.


2014 F250 6.7L PSD
2006 Sequoia 4.7L
2005 E500 5.0L
2018 Jeep Rubicon, Pentastar 3.6L
Re: From Shell: [Re: dblshock] #4114534 06/03/16 08:40 PM
Joined: Jan 2008
Posts: 3,502
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TiredTrucker Offline
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Joined: Jan 2008
Posts: 3,502
I have been running a Schaeffer 10w30 for a while in my factory remanned 12.7 S60 Detroit that now has 552,000 on the reman. Oil samples look as good or better than any that were done using 15w40. Regularly yanks around 32,000 lb of truck with up to 46,000 lb of cargo and it does it using from 5% to 15% biodiesel that it has been getting since I put the motor to work in this truck. All of the HD diesel OEM's have been factory filling the heavy truck diesels with 10w30 for a couple of years now at least, so it is not what they are going to do to rigs, it is what they have been doing. Just folks are starting to catch up to it.


Freedom is not about having the choice to do what you want, but the choice to do what you ought.
Re: From Shell: [Re: dblshock] #4114655 06/04/16 12:24 AM
Joined: Jul 2003
Posts: 5,257
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Silk Online Content
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I like how they cover themselves on the fuel economy.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: From Shell: [Re: dblshock] #4116201 06/05/16 07:54 PM
Joined: Mar 2016
Posts: 1,357
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jongies3 Offline
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I will stick with my 5w-40, rather have something the truck's been used to all it's life than change it. The things I haul and tow I can't imagine a 30w holding up to that heat and abuse. Sure newer diesel engines can run it just fine, but my truck is nearly 20 years old, and things are much different today than they were back then. I still manage to get about 16mpg in town and 20 on the highway so I can't complain about mileage. Pretty good for an old 7.3!


2004 Toyota Tacoma 3.4 V6: Mobil 1 AFE 0W-30, FRAM PH3614 filter
2003 Buick Park Avenue Ultra S/C 3.8 V6: PYB 10W-30, FRAM COR3387 filter
2013 Honda 400EX ATV: Mobil 1 Racing 4t 10W-40, OEM filter
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