Recent Topics
P0455 Large evap leak on my G35
by bowlofturtle - 08/20/19 11:49 PM
Gen 2 ctsv...best oil opinion
by Stickygreen - 08/20/19 11:10 PM
Peak Global Lifetime in Grand Caravan
by Crispysea - 08/20/19 11:03 PM
Supertech "e-cores", ST2 and ST10575 question
by TheScarletRogue - 08/20/19 10:08 PM
Oil for my 2006 5.9 Cummins
by mobilaltima - 08/20/19 09:35 PM
Vise stand
by clinebarger - 08/20/19 09:29 PM
Ecoboost filter
by mpgo4th - 08/20/19 09:16 PM
Removing Sludge to Prevent Engine Failure?
by 04CorCar - 08/20/19 09:05 PM
ULSD and HPFP's
by sloinker - 08/20/19 08:54 PM
2018 Grand Caravan 1 year review
by tiger862 - 08/20/19 08:28 PM
The 10mm socket
by cwilliamsws6 - 08/20/19 08:12 PM
What Fuel is it?
by MolaKule - 08/20/19 08:01 PM
Oil stashes..
by Mad_Hatter - 08/20/19 07:49 PM
Sealing Redundant Door
by gathermewool - 08/20/19 07:25 PM
Cam2 Dexos1 Gen 2 found at Napa
by bbhero - 08/20/19 06:59 PM
Flywheel broke 2012 V8 Silverado, with pics
by 01rangerxl - 08/20/19 05:10 PM
Blade for brush cutter
by Donald - 08/20/19 04:47 PM
Amplifier shipping nightmare
by cwilliamsws6 - 08/20/19 04:23 PM
O2 sensor recommendation
by Number_35 - 08/20/19 04:15 PM
Rental Home Insurance....
by JLTD - 08/20/19 03:30 PM
Newest Members
Al13, HughBeaumont, 04CorCar, reba, Dope
69013 Registered Users
Who's Online Now
49 registered members (AC1DD, aleneros, Averroes, AdditiveOCD, 04CorCar, Aero540T, 6 invisible), 1,051 guests, and 31 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics293,586
Posts5,042,924
Members69,013
Most Online3,532
Jul 30th, 2019
Donate to BITOG
Print Thread
Hop To
Page 1 of 2 1 2
Best Gas Mileage OIl #5185822 08/13/19 10:49 AM
Joined: Apr 2009
Posts: 22
C
cwhard Offline OP
OP Offline
C
Joined: Apr 2009
Posts: 22
I have my own ideas about motor oil and MPG which are based on time-honored math calculations and backed-up with an aftermarket digital monitor (to check the math). But I wanted to hear what others have found to be true in real-world testing. I am asking what Oil gives you the best gas mileage and how you know this to be true.

I am assuming that a Synthetic Oil offers less resistance, but I could be wrong. I used to use Exxon Superflo back in the 90's (that's 1990s for you comics). Because after exhaustive testing between Castrol, Pennzoil, then Superflo, I learned which offered less engine resistance thus the best gas mileage. I used a sales route that I ran every week and ran a few tanks through each oil change. The route never changed and since it was rural I used cruise control. Not terribly scientific, but close enough to develop a discernable pattern. The Superflo won handily.

As they say, your mileage may vary, but what is your experience?

Re: Best Gas Mileage OIl [Re: cwhard] #5185844 08/13/19 11:03 AM
Joined: Oct 2014
Posts: 1,549
J
Jimzz Offline
Offline
J
Joined: Oct 2014
Posts: 1,549
I doubt you will notice much difference from one to the other. I've known people to run 20w50 and not notice any real changes.

Oils affect will be so much smaller compared to tire type, air pressure, engine upkeep, and most important driving habits.


yup
Re: Best Gas Mileage OIl [Re: cwhard] #5185849 08/13/19 11:06 AM
Joined: Apr 2018
Posts: 1,089
I
Imp4 Offline
Offline
I
Joined: Apr 2018
Posts: 1,089
Originally Posted by cwhard
I have my own ideas about motor oil and MPG which are based on time-honored math calculations and backed-up with an aftermarket digital monitor (to check the math). But I wanted to hear what others have found to be true in real-world testing. I am asking what Oil gives you the best gas mileage and how you know this to be true.

I am assuming that a Synthetic Oil offers less resistance, but I could be wrong. I used to use Exxon Superflo back in the 90's (that's 1990s for you comics). Because after exhaustive testing between Castrol, Pennzoil, then Superflo, I learned which offered less engine resistance thus the best gas mileage. I used a sales route that I ran every week and ran a few tanks through each oil change. The route never changed and since it was rural I used cruise control. Not terribly scientific, but close enough to develop a discernable pattern. The Superflo won handily.

As they say, your mileage may vary, but what is your experience?

How about if you share your data to help start the conversation?


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Best Gas Mileage OIl [Re: cwhard] #5185851 08/13/19 11:08 AM
Joined: Aug 2017
Posts: 850
sloinker Offline
Offline
Joined: Aug 2017
Posts: 850
True enough that the less friction on internal engine parts the better the efficiency of the engine. Back in the day Arco tried graphite and it failed due to it clogging up passages and caused engine failure. I suppose now I would look for high Moly content. I'm sure there are other factors, mainly viscosity. Using the lowest viscosity oil that doesn't lead to engine damage would probably be the easiest way. 0W16 is all about the economy.


'16 Tiguan TSI Ravenol VST 5W40
'15 VW Golf TDI Ravenol VMP 5W30
'15 VW Golf Sportwagen TDI VMP 5W30
'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
'64 Plymouth Fury440 Red Line Blue Label 10W40
Re: Best Gas Mileage OIl [Re: cwhard] #5185856 08/13/19 11:13 AM
Joined: May 2018
Posts: 1,045
K
ka9mnx Offline
Offline
K
Joined: May 2018
Posts: 1,045
I've only used conventional oil for one OCI in my Ranger. It's been synthetic for 40 years. The difference between conv and syn was marginal but the syn won. I'm having very good reports with the ST I'm using now. Better than the previous runs of M1. I've always thought syn would give better MPG. It may be marginal but every little thing you do helps and the cost isn't much different.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Best Gas Mileage OIl [Re: cwhard] #5185862 08/13/19 11:20 AM
Joined: Jan 2015
Posts: 138
R
rideahorse Offline
Offline
R
Joined: Jan 2015
Posts: 138
The only way to know the real friction differences would be on a engine dyno for long runs. It would be the only way to keep the variables the same. Your test is a good thought but has no verifiable results that could be replicated

Re: Best Gas Mileage OIl [Re: cwhard] #5185889 08/13/19 11:51 AM
Joined: Mar 2017
Posts: 10,395
PimTac Offline
Offline
Joined: Mar 2017
Posts: 10,395
It would be good if you could share some of your data with us.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: Best Gas Mileage OIl [Re: cwhard] #5185911 08/13/19 12:13 PM
Joined: Jun 2014
Posts: 3,113
S
SirTanon Offline
Offline
S
Joined: Jun 2014
Posts: 3,113
It will make little difference.. In most engines, if you went from 0w-20 (which, by nature must be synthetic) to a 5w-30, you might see a small drop in MPG.. perhaps 1-5% difference.. but you would have a hard time actually measuring it. On the other hand, if you went from a full-synthetic 5w-30 to a conventional 5w-30, you would almost certainly get the exact same MPG.

This also assumes that ALL other factors are exactly the same, of course.

Just changing tire pressure by 4 or 5 PSI could result in the same 1-5% change in MPG. Heck, a change in ambient temperature of 10 degrees can even change your MPG by a couple percent.


2013 Nissan Altima SV - 2.5 liter/CVT - 118,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 67,000mi
2010 Ford Fusion - 274,500mi
Re: Best Gas Mileage OIl [Re: cwhard] #5185963 08/13/19 01:01 PM
Joined: Dec 2017
Posts: 2,497
J
JLTD Offline
Offline
J
Joined: Dec 2017
Posts: 2,497
Back in '04 I switched from conventional to synthetic of the same viscosity, as I had a 120 mile round trip once a week.

Driving the same highways at the same speeds, the synthetic gave better mpg and ran cooler.

YMMV


I use the overseas manual to choose my oil viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 149k, SS5w30/Amsoil

His: 2015 4Runner 55k, SS 5w20/Amsoil

Re: Best Gas Mileage OIl [Re: cwhard] #5186098 08/13/19 03:13 PM
Joined: Sep 2012
Posts: 662
N
NO2 Online Content
Online Content
N
Joined: Sep 2012
Posts: 662
Use synthetic because it sludges less, has better flow properties at low temperatures and lasts longer, creating less waste oil. With modern oils you won't see a noticeable difference between synthetic and conventional at the same viscosity - it only matters at the fleet level.

Re: Best Gas Mileage OIl [Re: cwhard] #5186107 08/13/19 03:20 PM
Joined: Apr 2004
Posts: 964
N
nascarnation Offline
Offline
N
Joined: Apr 2004
Posts: 964
Viscosity is viscosity.

I ran spin loss tests with really good Himmelstein torquemeters comparing syn and petro based transmission fluids and "surprise" they were the same if they had the same viscosity.

Remember that the mpg improvement claims of the early Mobil 1 advertising were based on going to 20wt when almost no OEM was speccing that.

Re: Best Gas Mileage OIl [Re: cwhard] #5186110 08/13/19 03:22 PM
Joined: Aug 2011
Posts: 2,090
GumbyJarvis Offline
Offline
Joined: Aug 2011
Posts: 2,090
During the short OCI (1000mi) I averaged 17.8 MPG according to the dash on Formula Shell Conventional 5w20 and a Carquest Red.

2500mi on the current fill, Schaeffers 5w20 and a Mahle I'm averaging 21.6 MPG

I always leave "Trip B" alone during a OCI to monitor my engine run time on the fill as well as the MPG for the entire fill.

Many factors do play into MPGs as well, probably moreso than oil choice.

Ambient temps, tire pressure, tire brand/model, fuel choice, driving conditions in general, etc. All play a factor. Idk if it was the changing of the oils, or maybe the switch from the previous truck owners Primewell tires (yuck) to the BF Goodrich Rugged Terrain T/A tires I have now, or other factors.

I use 89 octane and Sunoco usually.

Edit: you were the same one who posted the Amsoil post. I'm sure somewhere on their site they have some random graph that says you'll experience a minimal increase in MPGs using their oil, as most if not all oil companies do.

Last edited by GumbyJarvis; 08/13/19 03:33 PM.

2018 RAM 1500 SLT 5.7L HEMI 19K
Schaeffers 5w20 - Mahle OC 614

Disabled US Army Vet
OEF 2013-2014
Re: Best Gas Mileage OIl [Re: cwhard] #5186124 08/13/19 03:35 PM
Joined: Mar 2012
Posts: 640
T
tiger862 Offline
Offline
T
Joined: Mar 2012
Posts: 640
Only if I could get an oil to get better fuel mileage when idling.

Last edited by tiger862; 08/13/19 03:35 PM.

Tiger862
2018 Grand Caravan
Re: Best Gas Mileage OIl [Re: cwhard] #5186145 08/13/19 03:55 PM
Joined: Feb 2014
Posts: 3,320
Marco620 Offline
Offline
Joined: Feb 2014
Posts: 3,320
I would say redline oil but it's too thick by hths standards. I would look to a really basic oil like a Grp3 0w20 or whatever your can recommends.


15' Civic 1.8 i-vtec 262,000 mi Redline 5w20, BP Cvt fluid, Archoil9100
Tornado Chaser/Doberman Whisperer
Son of a Navy Corpsman.


Re: Best Gas Mileage OIl [Re: cwhard] #5186166 08/13/19 04:12 PM
Joined: Jun 2005
Posts: 5,412
A
ARB1977 Offline
Offline
A
Joined: Jun 2005
Posts: 5,412
Only way to improve fuel economy is the driver.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
Page 1 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™