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#2507810 - 01/27/12 07:18 PM 5w-30 vs 10w-40
awoess Offline


Registered: 01/09/10
Posts: 46
Loc: Maryland
with my oil pressure fluctuating someone suggested using 10w-40 instaed of 5w-30? is this bad advice? 2005 nissan frontier nismo 6 cylinder
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#2507813 - 01/27/12 07:20 PM Re: 5w-30 vs 10w-40 [Re: awoess]
OVERKILL Online   content


Registered: 04/28/08
Posts: 31722
Loc: Ontario, Canada
Is this fluctuation observed through a stock gauge or a reliable aftermarket mechanical one?
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#2507814 - 01/27/12 07:20 PM Re: 5w-30 vs 10w-40 [Re: awoess]
JRed Offline


Registered: 06/01/09
Posts: 1688
Loc: Virginia
Considering that you live in Louisiana it won't make much of a difference.

Go for it, I guess.


Edited by JRed (01/27/12 07:21 PM)
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#2507816 - 01/27/12 07:22 PM Re: 5w-30 vs 10w-40 [Re: awoess]
CATERHAM Offline


Registered: 11/18/05
Posts: 10074
Loc: Burlington, Ontario, Canada
Possibly yes.
OP does of course rise with engine rpm bur at a steady rpm it should be stable.
Under what conditions does it fluctuate?
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74 Lotus Europa, 5W-50
86 Porsche 928S, TGMO 0W-20 25% / M1 0W-40 75%
96 BMW 328i, Idemitsu/TGMO 0W-20 70% / M1 0W-40 30%
94 Caterham 7, FUCHS 0W-20

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#2507850 - 01/27/12 08:05 PM Re: 5w-30 vs 10w-40 [Re: awoess]
awoess Offline


Registered: 01/09/10
Posts: 46
Loc: Maryland
stock gauge... when i stop at a red light it goes just above the L and goes just above middle when driving? never reaches H level
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#2507856 - 01/27/12 08:10 PM Re: 5w-30 vs 10w-40 [Re: awoess]
CATERHAM Offline


Registered: 11/18/05
Posts: 10074
Loc: Burlington, Ontario, Canada
That just normal oil pressure behaviour.
Stick with the 5W-30 grade oil.
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74 Lotus Europa, 5W-50
86 Porsche 928S, TGMO 0W-20 25% / M1 0W-40 75%
96 BMW 328i, Idemitsu/TGMO 0W-20 70% / M1 0W-40 30%
94 Caterham 7, FUCHS 0W-20

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#2507859 - 01/27/12 08:12 PM Re: 5w-30 vs 10w-40 [Re: awoess]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 13587
Loc: South Texas,USA
10W40 won`t hurt a thing. Is this a VQ? I know the VQ Maxima`s FSM lists anything from 5W30-20W50.
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#2507938 - 01/27/12 09:16 PM Re: 5w-30 vs 10w-40 [Re: aquariuscsm]
Merkava_4 Offline


Registered: 01/30/07
Posts: 14285
Loc: Clovis, CA
Originally Posted By: aquariuscsm
10W40 won`t hurt a thing.


What about startup wear? That 10W-40 takes a full 5 minutes to reach all
the bearings on startup, but 5W-30 only takes 2/100ths of a second. grin2

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#2508228 - 01/28/12 08:37 AM Re: 5w-30 vs 10w-40 [Re: Merkava_4]
Garak Offline


Registered: 12/05/09
Posts: 18695
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Merkava_4
What about startup wear? That 10W-40 takes a full 5 minutes to reach all the bearings on startup, but 5W-30 only takes 2/100ths of a second. grin2


Of course, there's always that issue of immediate, catastrophic wear. wink

Aside from that, while CATERHAM has eloquently stated his case for 10w-30 being an obsolete synthetic grade, I'd argue that 10w-40 is about as obsolete a grade as one could possibly imagine, particularly in conventional. It was terrible oil years ago, and while oil certainly has improved, specifications have changed.

Any vehicles that currently specify a 40 weight oil are either diesels which spec HDEO (10w-40s tend to meet older diesel specs, not modern ones) or European cars, which have their own specifications, which the run of the mill 10w-40 certainly cannot meet. I can't think of any mainstream vehicle currently being sold in North America that would call for 10w-40 as the preferred grade in the manual.

For something well out of warranty that is speced for a 40 weight oil, 10w-40 would be at the bottom of my list of choices, unless it was dirt cheap. Up here at least, 5w-20, 5w-30, and 10w-30 are the grades that go on sale. So, my old truck and the Audi got 15w-40 at a much more attractive price than what 10w-40 goes for.

I know it takes 5 minutes for 10w-40 to reach all the bearings on start up, and probably double that for 15w-40, and maybe triple that north of the border. wink The 15w-40 was cheaper though.
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2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 51358
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#2508608 - 01/28/12 03:23 PM Re: 5w-30 vs 10w-40 [Re: awoess]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
It will still fluctuate, but in a different range.
Oils viscosity changes when hot/cold, and different RPM affect the pressure also.

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#2508720 - 01/28/12 05:43 PM Re: 5w-30 vs 10w-40 [Re: awoess]
dave1251 Offline


Registered: 07/15/05
Posts: 8071
Loc: Maricopa, AZ
Originally Posted By: awoess
stock gauge... when i stop at a red light it goes just above the L and goes just above middle when driving? never reaches H level


Does your check engine light come on? If not I suspect you do not have a low oil pressure.
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#2508733 - 01/28/12 05:57 PM Re: 5w-30 vs 10w-40 [Re: dave1251]
TFB1 Offline


Registered: 09/03/10
Posts: 3491
Loc: VA
Originally Posted By: dave1251
Originally Posted By: awoess
stock gauge... when i stop at a red light it goes just above the L and goes just above middle when driving? never reaches H level


Does your check engine light come on? If not I suspect you do not have a low oil pressure.


I'm yet to see a "check engine light"(the amber one operated by the PCM), that was triggered by low oil pressure... A low oil pressure light will be red and operated by a sender that connects directly to the light circuit...

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#2508848 - 01/28/12 07:39 PM Re: 5w-30 vs 10w-40 [Re: TFB1]
awoess Offline


Registered: 01/09/10
Posts: 46
Loc: Maryland
my check engine light does NOT come on.... i think i'm over reacting a little bit? thanks for the advice.. i'll stick with 5w-30 Royal Purple
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