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How much fuel economy difference 5-20 vs 5-30? #4722995
04/10/18 05:55 PM
04/10/18 05:55 PM
Joined: Dec 2012
Posts: 51
Connecticut
Mar57 Offline OP
Mar57  Offline OP
Joined: Dec 2012
Posts: 51
Connecticut
Owners manual calls for 5W-20 which I have been using. Car now has 106,xxx miles and I'm thinking of switching to 5W-30.
It's a 4 cyl. engine which delivers very good gas mileage. What do you think the mileage difference will be if I go with the 5W-30? 5W-20 is syn. and the 5W-30 would also be syn.

Last edited by wwillson; 04/10/18 08:40 PM. Reason: subject clarification
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4722997
04/10/18 05:57 PM
04/10/18 05:57 PM
Joined: Sep 2004
Posts: 22,128
Orlando, FL
Mr Nice Offline
Mr Nice  Offline
Joined: Sep 2004
Posts: 22,128
Orlando, FL
5w30 will be fine. What type of vehicle?

Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723001
04/10/18 05:58 PM
04/10/18 05:58 PM
Joined: Mar 2013
Posts: 5,143
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,143
The Midwest
If I had to take a wild guess, about 2/10 of 1 MPG. Very hard to measure in the real world.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723003
04/10/18 06:01 PM
04/10/18 06:01 PM
Joined: May 2012
Posts: 2,114
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 2,114
The land of USA-made Subies!
Nearly 100% certainty it will be 1% or less. You worrying about it probably affects it as much as the change to 5W30 does smile

Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723010
04/10/18 06:08 PM
04/10/18 06:08 PM
Joined: Jan 2009
Posts: 6,571
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,571
New England
Please make better thread titles.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: How much fuel economy difference 5-20 vs 5-30? [Re: skyactiv] #4723016
04/10/18 06:13 PM
04/10/18 06:13 PM
Joined: Jul 2014
Posts: 1,080
Winnipeg MB CA
Number_35 Offline
Number_35  Offline
Joined: Jul 2014
Posts: 1,080
Winnipeg MB CA
Originally Posted By: skyactiv
If I had to take a wild guess, about 2/10 of 1 MPG. Very hard to measure in the real world.

Agreed, the difference in mileage will be lost in the 'noise' of measurement error.

Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723017
04/10/18 06:13 PM
04/10/18 06:13 PM
Joined: Jan 2013
Posts: 1,444
America's Dairyland
LotI Online sleepy
LotI  Online Sleepy
Joined: Jan 2013
Posts: 1,444
America's Dairyland
0.001%


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
17 VW GTI
[IMG]http://badges.fuelly.com/images/sig-us/803455.png[/IMG]
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723035
04/10/18 06:30 PM
04/10/18 06:30 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Is there any indication there is abnormal wear in the engine? Or, is the model's factory oil spec known to be inadequate? If "no" to both, 5w30 is unecessary.

Last edited by Alex_V; 04/10/18 06:31 PM.

To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723096
04/10/18 07:37 PM
04/10/18 07:37 PM
Joined: Apr 2018
Posts: 653
Somewhere in time
Imp4 Offline
Imp4  Offline
Joined: Apr 2018
Posts: 653
Somewhere in time
0


2001 Mitsubishi Galant 2.4 - 160k+
Grandma's creampuff...
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723130
04/10/18 08:04 PM
04/10/18 08:04 PM
Joined: Sep 2014
Posts: 2,195
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,195
US-WA
So what I got from the the post is that a not at all old car runs on gas and requires oil. You can decide to either put oil in it, or to put oil in it. Hmmm. I vote oil. Difference in gas will be the tire pressure and distance traveled each time you turn the key. The numbers get better in warmer weather and via versa. Everything else is plucking hairs off polar bears [censored]. Not worth the trouble.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 104K STP syn HM 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 37k Idemitsu 0w20, 57047
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Imp4] #4723136
04/10/18 08:09 PM
04/10/18 08:09 PM
Joined: Oct 2009
Posts: 3,701
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,701
Wet side WA
Originally Posted By: Imp4
0


Gets my vote. thumbsup


2004 Corolla 128335
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74615
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: How much fuel economy difference 5-20 vs 5-30? [Re: JohnnyJohnson] #4723147
04/10/18 08:31 PM
04/10/18 08:31 PM
Joined: Dec 2012
Posts: 51
Connecticut
Mar57 Offline OP
Mar57  Offline OP
Joined: Dec 2012
Posts: 51
Connecticut
To the guys that have replied with an intelligent answer to my question I say "Thank you". To the other respondents that felt it was necessary to reply with a snarky response; I won't comment on your replies. I participate in another automotive forum where the members genuinely try to be helpful and polite to each other. The majority of BITOG members do try to be helpful and it's evident in their replies to posted questions.

Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723165
04/10/18 08:47 PM
04/10/18 08:47 PM
Joined: Mar 2015
Posts: 5,606
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,606
Virginia
A typical 5w20 has an HTHS of 2.6-2.7. A 5w30 is 3.0-3.1 unless it's Dexos approved then it is 3.2 for Valvoline Advanced full synthetic, and 3.3 for Mobil Super Synthetic. That's a bit of a sizable difference at the end of the day. I believe that would likely have an effect upon fuel economy. Even from a HTHS of 3.1 down to a 2.6 that is a fifteen percent difference between the two.

Last edited by bbhero; 04/10/18 09:01 PM.

Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723172
04/10/18 08:54 PM
04/10/18 08:54 PM
Joined: Apr 2018
Posts: 653
Somewhere in time
Imp4 Offline
Imp4  Offline
Joined: Apr 2018
Posts: 653
Somewhere in time
You have posted on and off here for the past six years. I bet in that time you've picked up a thing or two by hanging around this forum. I also think you probably know the answer to your own original question and that the answer is 'not much'.

My original response was not intended to be snarky, it just distilled your previously gained knowledge into a singular succinct response.

I think you are more knowledgeable than you give yourself credit for.


2001 Mitsubishi Galant 2.4 - 160k+
Grandma's creampuff...
Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57] #4723182
04/10/18 09:03 PM
04/10/18 09:03 PM
Joined: Mar 2016
Posts: 1,761
Western S.C.
CR94 Offline
CR94  Offline
Joined: Mar 2016
Posts: 1,761
Western S.C.
Not a huge difference, but not as insignificant as the snarky posters want you to believe. The difference in viscous drag in the bearings is on the order of 10-12%. Probably on the order of 1% overall fuel consumption difference, which is difficult to measure directly in everyday driving, because uncontrolled variables cause larger differences.

Last edited by CR94; 04/10/18 09:05 PM.

2011 Toyota Prius now at 95K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
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