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#3106080 - 08/26/13 11:37 AM Re: 10w30 vs 5w30 [Re: larryn]
J. A. Rizzo Offline


Registered: 08/31/05
Posts: 477
Loc: Chicago, IL
Use whichever one is cheaper. Neither you nor the vehicle will know the difference.
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Tradition is nothing but an excuse to not be creative.

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#3113709 - 09/03/13 04:17 PM Re: 10w30 vs 5w30 [Re: larryn]
SuzanneClerkin Offline


Registered: 09/25/12
Posts: 31
Loc: Houston, TX
There is no significant difference in the two weights when your engine is warm. The 5W or 10W designate the “winter” weight of the oil. It relates to the flow-ability of the oil at low temperatures or at start-up; with the 5W having better flow characteristics at lower temperatures. The second number, “30”, gives the operating viscosity at 100C; when your engine is hot. Additionally, be aware that GM recommends that you use the 5W-30 for optimum performance and gas economy. Hope this helps, larryn! – The Pennzoil Team

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#3114129 - 09/03/13 10:44 PM Re: 10w30 vs 5w30 [Re: larryn]
Blkstanger Offline


Registered: 08/13/11
Posts: 613
Loc: San Diego CA
I run 10w30 year round down here in San Diego.
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99 Ranger Supercab 4x4 4.0 145,000
Maxlife 10w30 Motorcraft FL-1A

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#3114199 - 09/04/13 01:25 AM Re: 10w30 vs 5w30 [Re: larryn]
sm00thpapa Offline


Registered: 07/09/11
Posts: 867
Loc: Spring Hill, FL
Towing in summer months you can get away with a straight 30 weight.
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09 FZ6R, K&N 204, SRT 15W-40
04 Ascender, P1, Napa SYN 5W-30
96 Cavalier, PC, Maxlife 10W-30

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#3114214 - 09/04/13 03:27 AM Re: 10w30 vs 5w30 [Re: larryn]
gfh77665 Offline


Registered: 09/01/08
Posts: 2245
Loc: Southeast Texas
Ssshhhh! Don't tell anyone, but I am running (almost free) straight 40wt. PYB in my Chevy truck this summer. MPG's, starting ease, oil pressure, RPM's, everything still the same. Remember...Quiet please!

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#3114222 - 09/04/13 03:41 AM Re: 10w30 vs 5w30 [Re: gfh77665]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 3502
Loc: Cajun Country, La.
Originally Posted By: gfh77665
Ssshhhh! Don't tell anyone, but I am running (almost free) straight 40wt. PYB in my Chevy truck this summer. MPG's, starting ease, oil pressure, RPM's, everything still the same. Remember...Quiet please!

By all means, BE QUIET! If your owners manual reads to use 5W20 and you use a different weight, you will have the BITOG 5W20 POLICE on you like white on rice! LOL
_________________________
2007 F150 XL, 4.2 V6
"One Filter, One OCI!"
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#3114256 - 09/04/13 05:19 AM Re: 10w30 vs 5w30 [Re: larryn]
gfh77665 Offline


Registered: 09/01/08
Posts: 2245
Loc: Southeast Texas
Its a late 90's Chevy truck, excellent condition, only 85K miles. I drive up & down I-10 everyday 80 mile round trip. It calls for 5-30 or 10-30, but the PYB 40 has worked perfect so far. Truck doesn't know the difference. I am going a 7000 mile OCI.

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#3114262 - 09/04/13 05:25 AM Re: 10w30 vs 5w30 [Re: gfh77665]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 3502
Loc: Cajun Country, La.
Originally Posted By: gfh77665
Its a late 90's Chevy truck, excellent condition, only 85K miles. I drive up & down I-10 everyday 80 mile round trip. It calls for 5-30 or 10-30, but the PYB 40 has worked perfect so far. Truck doesn't know the difference. I am going a 7000 mile OCI.

The truck might not know but we all now know! Keep your eyes in the rearview mirror for the BITOG POLICE! hide crackmeup
_________________________
2007 F150 XL, 4.2 V6
"One Filter, One OCI!"
Formula Shell 5W20, MC FL-400S

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#3114275 - 09/04/13 06:13 AM Re: 10w30 vs 5w30 [Re: BlueOvalFitter]
Merkava_4 Offline


Registered: 01/30/07
Posts: 9019
Loc: Clovis, CA
The BITOG POLICE would flip their lid if they knew I was doing 2K OCI's. grin2

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#3114290 - 09/04/13 06:36 AM Re: 10w30 vs 5w30 [Re: Merkava_4]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 3502
Loc: Cajun Country, La.
Originally Posted By: Merkava_4
The BITOG POLICE would flip their lid if they knew I was doing 2K OCI's. grin2

OMG! Are you trying to give the BITOG POLICE cardiac arrest?
_________________________
2007 F150 XL, 4.2 V6
"One Filter, One OCI!"
Formula Shell 5W20, MC FL-400S

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#3114323 - 09/04/13 07:28 AM Re: 10w30 vs 5w30 [Re: gfh77665]
Jim Allen Offline


Registered: 08/12/05
Posts: 4477
Loc: NW Ohio
Originally Posted By: gfh77665
Ssshhhh! Don't tell anyone, but I am running (almost free) straight 40wt. PYB in my Chevy truck this summer. MPG's, starting ease, oil pressure, RPM's, everything still the same. Remember...Quiet please!


I have Spock ears... I heard ( : < )

The part in red is impossible. A 40 grade is thicker at all temps than 5W30 or 5W20, so oil pressure will be higher at any given oil temp. It's worse with a straight grade oil. If you aren't seeing it on your gauge, it's an OE dampened gauge or one of those "idiot-lights-with-a-needle" so that it doesn't show the difference. My statement is based on physics but I have verified it with accurate gauges on two trucks. With one (diesel), when I went from 15W40 to 10W30 HDEO, there was a 4-5 psi drop in oil pressure at the same oil temp. In another (gas) truck, going from 5W20 to 10W30 there was a 5-8 psi increase.

I'm not saying that 5 psi one way or another is hugely significant on a warmed up engine, just that the difference is there whether your gauge is indicating it or not.

In Texas, you can get away with a straight grade oil more than most.

For the benefit of others, one of the disadvantages of running a heavier-than-spec'ed oil is that you will put your oil filter closer to bypass with the increased pressure of a cold start. That means you really need to feather-foot while the engine is cold because if you don't you will be blowing unfiltered oil past the bypass until it worms up and thins out. This is another thing I have verified with one of my trucks. I know the bypass cracking spec for the oil filter I use and I have a differential pressure gauge set on my engine so I can read the pressure on both sides of the filter.

I am currently running 10W30 in an engine designed for 5W20... an experiment. The cracking DP for the bypass valve in the filter I use is 8psi and I bump up against that even on a 70F start when the engine flares upon start (EFI). I have to drive really easy until the oil reaches about 150F (yes, I can also read oil temp) before I can engage in spirited driving. Even with the oil at 190F+, when I bump up against the rev limiter at 5500 rpm, I am bumping up against the bypass DP as well. I have just finished datalogging with the 10W30 and will be changing the oil back to 5W20 and doing it all over again to see wassup. Will also be testing the new DP of some popular oil filters just for grins.

And there is another price to pay for thicker-than-recommended oil and for single grade oil that doesn't flow well cold. "Cold" is relative. To the oil industry, anything under 100F is "cold" and if you look at the viscometrics of a straight 40 grade at, say, 70F, it's running at 486 cSt (40c scale, about 32 cSt on the 100c scale) which puts it thicker than 60 grade motor oil and at the upper end of 140 grade gear oil. That's at a relatively warm 70F start. I shudder to think of a 40 F start. A multigrade oil does much better.



This was a borderline hijack but I thought it was relevant to the discussion.
_________________________
Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive

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#3114347 - 09/04/13 07:57 AM Re: 10w30 vs 5w30 [Re: gfh77665]
jimmy87 Offline


Registered: 04/08/12
Posts: 194
Loc: texas
Originally Posted By: gfh77665
Its a late 90's Chevy truck, excellent condition, only 85K miles. I drive up & down I-10 everyday 80 mile round trip. It calls for 5-30 or 10-30, but the PYB 40 has worked perfect so far. Truck doesn't know the difference. I am going a 7000 mile OCI.


Are you in El Paso?
_________________________
2013 GMC SIERRA 5.3L
2002 Toyota highlander 2.4L

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#3114394 - 09/04/13 09:08 AM Re: 10w30 vs 5w30 [Re: gfh77665]
SLCraig Offline


Registered: 12/21/08
Posts: 5267
Loc: London, ON, Canada
Originally Posted By: gfh77665
10-30 typically is a bit thicker at high temps, and is a bit more shear stable. Again, the "5" won't benefit any in this application.


This is not always true, M1 5w30 is thicker at temp than the 10w30 is. At least last time I saw the specs it was.
_________________________
2010 Civic SI sedan 6MT
F1 Syn 5w30 | PureONE | Pennzoil MTF

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#3114468 - 09/04/13 10:39 AM Re: 10w30 vs 5w30 [Re: larryn]
KCJeep Offline


Registered: 06/30/11
Posts: 4483
Loc: Mahzurrah!
Good stuff as always Jim. So partial bypass at start up may not be as rare as we've been told when using thicker oils? Am I getting that right?
_________________________
2004 Jeep Grand Cherokee 4.0 @ 121k Pennzoil HM 10w30
Napa Silver 31515
KIA Sedona 38k, Chevy Lumina 170k, Chrysler Sebring 171k, Ford Ranger 175k!

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#3114566 - 09/04/13 12:02 PM Re: 10w30 vs 5w30 [Re: KCJeep]
Jim Allen Offline


Registered: 08/12/05
Posts: 4477
Loc: NW Ohio
Originally Posted By: KCJeep
Good stuff as always Jim. So partial bypass at start up may not be as rare as we've been told when using thicker oils? Am I getting that right?


It depends, KC. My truck running one grade thicker than specs can reach the bypass threshold on a cold start, even with a fresh filter. Extrapolate to an engine using oil one two grades thicker, and a multigrade with a 100 VI... can't imagine it NOT bypassing on a cold start (again cold is relative).

I was probably the guy telling you about bypass events (it's my "thing" now), saying they are "rare." That was based on what I was told by several oil filter engineers and on my own experience/testing but I have tried to caveat that by saying, "With the correct oil viscosity." Running oil thicker than spec'ed or single grade, tosses that out the window.

I expected to see lot's more bypass events on my truck (running more than one grade over spec) but I have to have caution in the way I operate it to prevent them. Within a few days, I'll have 5W20 in it again and can see how it works with the right viscosity. My first test filter will be the Ford-spec'ed FL820s.
_________________________
Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive

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