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#2440735 - 11/21/11 10:29 AM Can I use 10w40 in my vehicle?
zerosoma Offline


Registered: 08/12/11
Posts: 2192
Loc: south dakota, usa
My vehicle calls for 5w30, and 10w30 in the right conditions (i.e. summer driving). I found some cheap 10w40 that I posted about from Valvoline and I'm wondering if it would be fine in my vehicle. It's the Hyundai in my sig.


Would I need to buy more oil to mix in with it so it takes down the viscosity more? If so I may return it because I won't have much use for it.

Can I use full 10w40 in my SUV?

Thanks!


Edited by zerosoma (11/21/11 10:29 AM)
_________________________
2004 Hyundai Santa Fe LX 3.5L (93k) [Havoline SM 5w30/PureOne PL14459]
2005 Toyota Prius (189k) [Napa Syn 5w30/PureOne PL14476]

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#2440747 - 11/21/11 10:47 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
carwreck Offline


Registered: 04/04/09
Posts: 464
Loc: CT
Of course you can use it.

But it may lower your gas mileage by 1-2%, will vary with car, and this loss may only be temporary.

My car also calls for 5W30 or 10W30. I had some 10W40 Valvoline that I used in an oil change.
Car takes 4.5 quarts; I mixed 1 qt 10W40 with 3.5 qts 5W30.
I did not measure mgp, but rpm dropped immediataly at idle by about 100 rpm. This was only temporary in my car. After about 2 weeks, the rpm's were back to normal.
________________________________________

1999 OLDS GLS 3.4L

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#2440749 - 11/21/11 10:49 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
SuperDave456 Offline


Registered: 10/29/08
Posts: 2198
Loc: Dallas, Texas
Being in South Dakota I would use it as top off oil in the Summers.
It is crazy cold there from what I understand. During colder months I would stick with your synthetic 5w30 and what not with the really low pour points.

I'm currently using a 40 weight in my 2002 Ford Taurus with its 3.0 SOHC V6 and 176,000 miles. However, It has a small leak that the 40 weight really slows down, and it only gets down to the 40's at night here, then back up into the 70's and 80's during the day.

Can you use it? Sure, but I'd be careful with your winters.

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#2440758 - 11/21/11 10:54 AM Re: Can I use 10w40 in my vehicle? [Re: SuperDave456]
Brent_G Offline


Registered: 07/12/11
Posts: 353
Loc: Aberdeen SD
You could use it as a summer fill. But not in winter, run a 5w30 or 0w30. not sure what part of the state your in, but it gets cold pretty much everywhere lol
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#2440786 - 11/21/11 11:21 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
chubbs1 Offline


Registered: 06/09/10
Posts: 4574
Loc: Merritt Island FL, USA
As said above, just do not use it in the SD winter. Strictly a summer thing.
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#2440787 - 11/21/11 11:23 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
zerosoma Offline


Registered: 08/12/11
Posts: 2192
Loc: south dakota, usa
Summers can get up to an average of 80-100 degrees, spring usually floats around 68-74. This would definitely be a summer oil.

I have to take it back anyway because I found out they charged me $3.99/qt when it was marked for $1.99/qt. So I either may return it or just have them give me my money back fully.

Thanks for the responses!
_________________________
2004 Hyundai Santa Fe LX 3.5L (93k) [Havoline SM 5w30/PureOne PL14459]
2005 Toyota Prius (189k) [Napa Syn 5w30/PureOne PL14476]

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#2440817 - 11/21/11 11:38 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
yeti Offline


Registered: 10/31/05
Posts: 632
Loc: windsor, ontario, canada.
here's a thought -- your vehicle calls for 5w-30, so buy 5w-30 and use it. i don't understand why there are so many threads devoted to this topic -- can i use a (thicker/much thicker)oil in my car that calls for a 5w-30, or a 20w oil? 10w-40 won't hurt anything, but using that logic, go with a 20w-50, or mabye a 10w-60.not being sarcastic -- just go with the spec'd grade.
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#2440826 - 11/21/11 11:43 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
CATERHAM Offline


Registered: 11/18/05
Posts: 8986
Loc: Burlington, Ontario, Canada
Running a grade heavier than spec' oil because it was cheap is usually false economy due to the reduced fuel mileage (whether you can measure it or not), unless the intent is to use it for blending purposes with a lighter than spec' oil.
_________________________
'74 Lotus Europa - 5W-50,VSOT
'86 Porsche 928S - TGMO 0W-20/M1 0W-40 blend
'96 BMW 328i - Idemitsu 0W-20/M1 0W-40 "
'94 Caterham 7 - Sustina 0W-20

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#2440832 - 11/21/11 11:47 AM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
TFB1 Offline


Registered: 09/03/10
Posts: 2622
Loc: VA
In ND I'd defiantly use it in the late spring, summer and early fall, then my right foot weighs about 40Lbs, gas mileage isn't a concern...

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#2440861 - 11/21/11 12:14 PM Re: Can I use 10w40 in my vehicle? [Re: TFB1]
CATERHAM Offline


Registered: 11/18/05
Posts: 8986
Loc: Burlington, Ontario, Canada
Originally Posted By: TFB1
gas mileage isn't a concern...

That's easy for you to say!
_________________________
'74 Lotus Europa - 5W-50,VSOT
'86 Porsche 928S - TGMO 0W-20/M1 0W-40 blend
'96 BMW 328i - Idemitsu 0W-20/M1 0W-40 "
'94 Caterham 7 - Sustina 0W-20

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#2440876 - 11/21/11 12:27 PM Re: Can I use 10w40 in my vehicle? [Re: CATERHAM]
ammolab Offline


Registered: 01/16/06
Posts: 520
Loc: Ruidoso, NM USA
I have to wonder about the dangers of using a 10W30 or 10W40 oil in wintertime....

Back in the 'day' (1950s and 1960s) these 10W oils were the WINTER OILS!....and we worried about the "danger" of using these "W" (Water weight :)) oils in the SUMMERTIME!
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1986 BMW K75C
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#2440980 - 11/21/11 02:28 PM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
old1 Offline


Registered: 01/04/11
Posts: 61
Loc: Nebraska USA rural
I swear that I have read on either this site or another that the multi weight oils 10/40 for example, are suppose to perform as a 10 wt. oil when cold, but retain the viscosity of a 40 wt. when hot. Is that right? so wouldn't warm weather use of a 10/40 be ok.

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#2441066 - 11/21/11 04:35 PM Re: Can I use 10w40 in my vehicle? [Re: old1]
CATERHAM Offline


Registered: 11/18/05
Posts: 8986
Loc: Burlington, Ontario, Canada
You don't have swear, I believe you.
Technology marches on and 10W-XX oils are no longer recommended for winter use. They are much heavier on start-up at all temp's than 5W-XX and 0W-XX oils.
A 40wt oil is simply heavier than necessary for your application.
_________________________
'74 Lotus Europa - 5W-50,VSOT
'86 Porsche 928S - TGMO 0W-20/M1 0W-40 blend
'96 BMW 328i - Idemitsu 0W-20/M1 0W-40 "
'94 Caterham 7 - Sustina 0W-20

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#2441088 - 11/21/11 05:00 PM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
Cristobal Offline


Registered: 01/02/11
Posts: 1852
Loc: Montebello, CA
I would only use it between April 1 and about the end of November in your area. Thet is a period of about 34 weeks.
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The Poodles will conquer the Galaxy. All Cats must die!

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#2441139 - 11/21/11 06:00 PM Re: Can I use 10w40 in my vehicle? [Re: zerosoma]
aquariuscsm Offline


Registered: 12/30/06
Posts: 8909
Loc: South Texas,USA
Absolutely you can! Won`t hurt a thing. If you lived in Australia,here`s what Shell says:

Premium

HELIX ULTRA 5W-40

Standard

HELIX HX7 K 15W-50
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1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
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