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#4722995 - 04/10/18 06:55 PM How much fuel economy difference 5-20 vs 5-30?
Mar57 Offline


Registered: 12/18/12
Posts: 49
Loc: 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.


Edited by wwillson (04/10/18 09:40 PM)
Edit Reason: subject clarification

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#4722997 - 04/10/18 06:57 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
Mr Nice Offline


Registered: 09/12/04
Posts: 21526
Loc: Orlando, FL
5w30 will be fine. What type of vehicle?

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#4723001 - 04/10/18 06:58 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
skyactiv Online   content


Registered: 03/02/13
Posts: 4642
Loc: The Midwest
If I had to take a wild guess, about 2/10 of 1 MPG. Very hard to measure in the real world.
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#4723003 - 04/10/18 07:01 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1263
Loc: Winchester, Indiana
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

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#4723010 - 04/10/18 07:08 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
gathermewool Offline


Registered: 01/09/09
Posts: 6123
Loc: New England
Please make better thread titles.

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#4723016 - 04/10/18 07:13 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: skyactiv]
Number_35 Offline


Registered: 07/07/14
Posts: 863
Loc: 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.

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#4723017 - 04/10/18 07:13 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
LotI Offline


Registered: 01/01/13
Posts: 1339
Loc: America's Dairyland
0.001%
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#4723035 - 04/10/18 07:30 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
Alex_V Offline


Registered: 04/10/16
Posts: 1181
Loc: 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.


Edited by Alex_V (04/10/18 07:31 PM)
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#4723096 - 04/10/18 08:37 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
Imp4 Offline


Registered: 04/06/18
Posts: 340
Loc: Somewhere in time
0
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2001 Mitsubishi Galant 2.4 - 157k+
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#4723130 - 04/10/18 09:04 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
Dyusik Offline


Registered: 09/26/14
Posts: 2079
Loc: 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.
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#4723136 - 04/10/18 09:09 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Imp4]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 3036
Loc: Wet side WA
Originally Posted By: Imp4
0


Gets my vote. thumbsup
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2004 Corolla 123843
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: Castrol EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74202
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18

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#4723147 - 04/10/18 09:31 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: JohnnyJohnson]
Mar57 Offline


Registered: 12/18/12
Posts: 49
Loc: 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.

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#4723165 - 04/10/18 09:47 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
bbhero Offline


Registered: 03/20/15
Posts: 4841
Loc: 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.


Edited by bbhero (04/10/18 10:01 PM)
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#4723172 - 04/10/18 09:54 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
Imp4 Offline


Registered: 04/06/18
Posts: 340
Loc: 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.
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2001 Mitsubishi Galant 2.4 - 157k+
Grandma's creampuff...

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#4723182 - 04/10/18 10:03 PM Re: How much fuel economy difference 5-20 vs 5-30? [Re: Mar57]
CR94 Offline


Registered: 03/20/16
Posts: 1288
Loc: Western S.C. since 1996
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.


Edited by CR94 (04/10/18 10:05 PM)
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