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#4536351 - 10/07/17 04:36 PM Anyone running 0W20, 30, or 40 in a 10W30 engine?
Nicasio Offline


Registered: 11/24/13
Posts: 76
Loc: Rocklin, CA USA
Iíd like to know, would I benefit in switching to an 0W oil in my Mustangís 351W pushrod motor. Itís just a standard older 351W pushrod motor. 10W30 was what was always recommend back then. Car is hardly driven. Maybe once or twice a month.
_________________________
2017 Nissan Armada AWD Platinum
2011 Honda Civic DX
2007 Subaru Impreza 2.5i Wagon
2006 Pontiac Vibe
2004 BMW 330i ZHP 6sp
1989 Mustang w/Vortech S/C 351w

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#4536359 - 10/07/17 04:43 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
KCJeep Offline


Registered: 06/30/11
Posts: 6996
Loc: Mahzurrah!
Since you are in CA I am assuming brutal cold starts are off the table, so I would say NONE benefit wise. Unless you just want to use a real high quality full syn...it won't hurt anything either.
_________________________
09 Lincoln MKZ AWD 91k - M1 AFE 0w30
12 KIA Sedona 86k - Edge 0w40
09 Ford Focus 129k - GTX UltraClean 5w30
00 Chevy Lumina 195k - Supertech FS HM 5w30
04 Jeep Grand Cherokee gone but not forgotten...

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#4536370 - 10/07/17 05:12 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
CT8 Offline


Registered: 10/09/14
Posts: 10920
Loc: Idaho
The real advantage of a 0W motor oil would be in below lets sat -30*f so no but run the oil anyway 0W-40 Mobil 1 Is a great oil
_________________________
"Don't let your preconceived notions get in the way of facts."Geoff Metcalf"

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#4536374 - 10/07/17 05:19 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
d00df00d Online   content


Registered: 10/20/05
Posts: 11199
Loc: PA
Originally Posted By: Nicasio
Iíd like to know, would I benefit in switching to an 0W oil in my Mustangís 351W pushrod motor. Itís just a standard older 351W pushrod motor. 10W30 was what was always recommend back then. Car is hardly driven. Maybe once or twice a month.

Depends on the 0w.

For example: If you pick a fuel economy oriented 0w-30 (e.g. Mobil 1 Advanced Fuel Economy 0w-30), it'll flow better on a cold start, even in a warm climate. However, being a modern synthetic that meets modern API and ILSAC specs, it should still protect better and last longer than an old 10w-30.

On the other hand, some 0w-30 and 0w-40 oils are formulated for tough long-drain Euro specs (e.g. Castrol Edge 0w-30, Mobil 1 FS 0w-40). Those are thicker overall, so they won't be much better than those old 10w-30s on a cold start in a warm climate -- but they'll protect and last WAY better.

If you go with a 0w-20, it'll flow WAY better on a cold start, and cool your engine better. Technically it won't be as thick as an old 10w-30 when brand new, but being a synthetic it'll hold up much better, so it might not be much worse by the end of an OCI. Hard to say how well it'd protect, though I wouldn't be shocked if it worked just fine.

Then there are those weirdo low-ash Euro 0w oils, like Mobil 1 ESP X1 or Pennzoil Platinum Euro LX. They meet really tough wear control specs and tend to have the best base oils, but they also have low-ash additive packs -- great for deposit control and catalytic converter health, good for wear, not good for OCI length.
_________________________
2011 Mazda RX-8 R3
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#4536394 - 10/07/17 05:56 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
PimTac Offline


Registered: 03/04/17
Posts: 4213
Loc: Soviet State of Washington
What year is this engine? If it's old and has been running 10w all its life I would be leary of running a 0w in it. You don't have cold winters in your location. I would stay with what has been working all along.
_________________________
2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter


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#4536405 - 10/07/17 06:08 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
4WD Offline


Registered: 09/21/10
Posts: 6351
Loc: Texas
Yes, but GM does not agree ...

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#4536425 - 10/07/17 06:40 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: d00df00d]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
Originally Posted By: d00df00d

If you go with a 0w-20, it'll flow WAY better on a cold start, and cool your engine better...


Only at temps well below 0 deg F. It might not cool any better. And the thinner viscosity might be a detriment to your engine bearings without knowing more about this particular 351. For a factory original engine with plenty of miles and specced for 30 grade there'd be no 20 grade for me.

Considering your typical year round starting ambient temp is in the 30-100 degF range, any of the 0/5/10W oils will flow approx the same at startup. If it were me, I'd stick with the 5/10w-30/40 oils for your Mustang. The 10w-30 is still a good recommendation...especially from April-September. An A3/B4 0w-30/40 oil could still work well for you even if there's no real benefit to the 0w. If that supercharger is an add on, that could change things.

I note that Rocklin, CA hasn't made any new monthly temperature highs since 1988! It would appear there's no global warming in Rocklin.
_________________________
----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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#4536545 - 10/07/17 09:12 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
BrocLuno Offline


Registered: 09/06/15
Posts: 5506
Loc: Kalifornia Kollective
Rocklin can get down to 20* on some day/nights. I have a new to me 351 also and I will be trying 0W-40 Mobil 1 Euro formula to see if I can get it to work ... Engine has 83K and is still modestly tight, so I'm hoping that I won't have too many drain-off issues as the truck will sit for up to a week at a time ...

If it's noisy and clattery on cold start after sitting, it'll get swapped out for some Delo 400 15W-30 (on hand) or 15W-40 (readily available) and I'll move the 0W-40 to something else. I don't tolerate noisy cold starts. Mobil 1 has a spotty record in my various vehicles for cold start noise. But I know it's good oil, so I always give it a try smile

Plus I have stock in XOM, so I like to support the firm if I can laugh
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4536555 - 10/07/17 09:21 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
Something like M1 0w-30 AFE might give you a tick higher fuel economy, which you'll never measure, much less notice. Other than that, I can't think of much. Now, if you're already putting synthetic in there, M1 0w-30 AFE won't cost extra.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4536589 - 10/07/17 09:57 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
bubbatime Offline


Registered: 03/18/08
Posts: 5619
Loc: South Florida

Flat tappet cam? Most of the passenger car oils have been watered down. I would not run 0W30.

Rotella 15W40 is what you want. Delo 15W30 or Rotella 10W30 are also good choices.
_________________________
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4536590 - 10/07/17 09:59 PM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
bubbatime Offline


Registered: 03/18/08
Posts: 5619
Loc: South Florida
Double tap
_________________________
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4536699 - 10/08/17 12:02 AM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
Nicasio Offline


Registered: 11/24/13
Posts: 76
Loc: Rocklin, CA USA
Itís got a COMP hydraulic roller cam set up, Brodix aluminum heads, 11psi Vortech, BBK long tube headers, & Magnaflow high flow catalytic converters. I believe itís gotta be an early to mid 90ís short block. Like in the Ford Trucks/Lightnings. Dynoed 498hp/491tq to back tires at 5800 rpms. Makes 400lb tq at 2750 rpms. Been using M1 10w30 in it. I donít drive it much at all so I change the oil yearly. Winters are frosty here in Rocklin sometimes. Summers are in the 100ís... For my set up, what would yíall try to better the M1 10W30?
_________________________
2017 Nissan Armada AWD Platinum
2011 Honda Civic DX
2007 Subaru Impreza 2.5i Wagon
2006 Pontiac Vibe
2004 BMW 330i ZHP 6sp
1989 Mustang w/Vortech S/C 351w

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#4536704 - 10/08/17 12:11 AM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: d00df00d]
Shannow Online   content


Registered: 12/12/02
Posts: 39824
Loc: 'Stralia
Originally Posted By: d00df00d
For example: If you pick a fuel economy oriented 0w-30 (e.g. Mobil 1 Advanced Fuel Economy 0w-30), it'll flow better on a cold start, even in a warm climate. However, being a modern synthetic that meets modern API and ILSAC specs, it should still protect better and last longer than an old 10w-30.


OK, where's your evidence for this old chestnut ?

It's not true, no matter how many people repeat it.

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#4536729 - 10/08/17 01:06 AM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Those hydraulic roller lifters are sensitive to oil viscosity. Go too thin and they'll bleed down and go flat. Go too thick and they won't pump up. If you switch to 0W-20 you stand a good chance of getting iron soup.

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#4536764 - 10/08/17 03:49 AM Re: Anyone running 0W20, 30, or 40 in a 10W30 engine? [Re: Nicasio]
PimTac Offline


Registered: 03/04/17
Posts: 4213
Loc: Soviet State of Washington
Sounds like a HDEO would work fine here. Delo, Delva, Rotella, whichever brand you prefer
_________________________
2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter


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