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#4724345 - 04/12/18 06:47 AM Changing from 5W-30 to 0W-40
Kira Offline


Registered: 08/19/10
Posts: 4917
Loc: Champlain/Hudson Valley
REAL BRIEF:
I drive a 2007 Volvo V70 base (non-turbo) 2.4l I-5 auto.
The car calls for 5W-30 with synthetic being preferred to keep the PCV system clean.

I'm running Mobil1 0W-40 at the moment and it appears my mileage is going down a lot.

I tally mileage the "hard way" monthly. I take total gallons and divide by total miles.

A 500 mile trip garnered me a >17 mpg quick calculation. I usually get 26-27 mpg on such trips.

Is it possible for mileage to take such a hit? I'll resurrect this thread at the end of my month. That's 2 weeks from now.

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#4724348 - 04/12/18 06:50 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
SubieRubyRoo Online   content


Registered: 05/14/12
Posts: 895
Loc: Winchester, Indiana
No. At max you may see a 1mpg difference, likely even less than that. Even if you used a REALLY thin 5W30, and the thickest 0W40, you're not going to see anywhere near that drop. Something else is wrong if your average does not come back up.

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#4724354 - 04/12/18 06:53 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
demarpaint Offline


Registered: 07/03/05
Posts: 29407
Loc: NY
I doubt it's the oil. Sounds like a mechanical issue. I doubt your tires are that grossly under inflated, even if they were a 10 mpg hit is huge. FI injector problem? Is the oil level rising? Oil stink of gas? I doubt it has to do with seasonal fuel either, not that much of a hit. Have you done a UOA? Odds of the oil being the problem, I'd say about 0%.
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#4724355 - 04/12/18 06:56 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
Trav Offline


Registered: 11/20/06
Posts: 18268
Loc: MA, Mittelfranken.de
If you are loosing 9-10mpg then there is definitely something else going on.
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#4724357 - 04/12/18 06:58 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
Shannow Offline


Registered: 12/12/02
Posts: 39055
Loc: 'Stralia
You are joking, aren't you ?

Been here how long ???

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#4724363 - 04/12/18 07:04 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
4WD Offline


Registered: 09/21/10
Posts: 6046
Loc: Texas/International
I made that switch on two vehicles and nothing to report probably want a mechanic to do some testing
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2017 Tahoe 5.3L 4WD
2014 Fusion Hybrid
2013 Cruze RS 1.4T
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#4724366 - 04/12/18 07:04 AM Re: Changing from 5W-30 to 0W-40 [Re: Shannow]
Kira Offline


Registered: 08/19/10
Posts: 4917
Loc: Champlain/Hudson Valley
I just wanted to be brief by presenting my first blip of "data".

Yes, I'm aware that an oil selection couldn't possibly account for that much difference.
I'm praying it's a bad sensor or mechanical problem.

At first blush, the engine seems to like the 0W-40. It's quiet and strong.

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#4724371 - 04/12/18 07:07 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
Reddy45 Offline


Registered: 08/15/08
Posts: 2765
Loc: USA
Have you been keeping the lingonberry reservoir topped off? Swedish cars can do this if you don't maintain good lingonberry levels.

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#4724374 - 04/12/18 07:10 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
toneydoc Offline


Registered: 12/16/11
Posts: 1675
Loc: War Eagle
check your mathematics
_________________________
1994 Jeep 157k Mobil 5000 5w30
2014 Camry 31k QS AD 5w30
2018 Jeep Cherokee 1k factory fill
2014 HD Ultra 34k Mobil1 15w50
2012 Rav4 35k PP 5w20

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#4724375 - 04/12/18 07:11 AM Re: Changing from 5W-30 to 0W-40 [Re: toneydoc]
Shannow Offline


Registered: 12/12/02
Posts: 39055
Loc: 'Stralia
Originally Posted By: toneydoc
check your mathematics


LOL, a month to get 500 miles ???

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#4724377 - 04/12/18 07:12 AM Re: Changing from 5W-30 to 0W-40 [Re: Shannow]
LotI Offline


Registered: 01/01/13
Posts: 1231
Loc: America's Dairyland
Originally Posted By: Shannow
Originally Posted By: toneydoc
check your mathematics


LOL, a month to get 500 miles ???

Good public transportation!
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03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
17 Mazda6 GT

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#4724393 - 04/12/18 07:31 AM Re: Changing from 5W-30 to 0W-40 [Re: LotI]
dlundblad Offline


Registered: 09/30/13
Posts: 9683
Loc: Indiana
Originally Posted By: LotI
Originally Posted By: Shannow
Originally Posted By: toneydoc
check your mathematics


LOL, a month to get 500 miles ???

Good public transportation!


My guess would be poor driving conditions given the distance over the time.

Cold starts, cold operating, allowing to idle until warm, city driving while cold etc. etc.
_________________________
03 Jeep WJ 4.0 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU819X
97 Chevy Blazer 4.3 142k Rotella T5 10w30 Fram TG3980


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#4724399 - 04/12/18 07:38 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3824
Loc: New England
Parking brake is on?
;^)
JK, hope nothing is seriously wrong with the vehicle!
_________________________
2014 Forester XT, 80500 miles
Last Change;
Valvoline Full Synthetic 5W30 d1G2
Tokyo Roki 15208AA170 filter

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#4724401 - 04/12/18 07:41 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
CT8 Offline


Registered: 10/09/14
Posts: 10578
Loc: Idaho
I doubt there is a difference between the oils MPG.But then this is BITOG.
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Artificial intelligence is no match for natural stupidity, we shall prevail

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#4724404 - 04/12/18 07:43 AM Re: Changing from 5W-30 to 0W-40 [Re: Kira]
Dwane17 Offline


Registered: 02/28/10
Posts: 27
Loc: SW Oklahoma

OP stated a 500 mile trip, not 500 miles in a month

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