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#3114574 - 09/04/13 12:11 PM Re: 10w30 vs 5w30 [Re: larryn]
webfors Offline


Registered: 06/06/06
Posts: 3654
Loc: Ottawa
Originally Posted By: larryn
10w30 vs 5w30 when towing in hot weather 95/100F , oil will be changed after 5000 to 6000 mile 6 week trip.oil is quaker state UD.truck is an 09, 6L 1500 silverado.trailer is approx. 6800#.


yes, I mean no, I mean it depends, err...

Check the 100 degree viscosities to answer that question grin

A 0w30 might be the best choice... all depends on the product and it's specs.
_________________________
08 Forester 5mt, AFE 0w30, XG7317
13 Dodge GC, VWB 5w20, Mopar OF
13 Suzuki SFV650, OEM 10w40, OEM OF
All small engines; RT5 10w30

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#3114624 - 09/04/13 12:59 PM Re: 10w30 vs 5w30 [Re: larryn]
Blue_Angel Offline


Registered: 07/24/13
Posts: 110
Loc: Ottawa, Ontario, Canada
Mobil 1 @ 100C, 40C, VI, 150C (Canada):

SN SN SN
0W-30 5W-30 10W-30
10.9 11 10.1
62.9 61.7 63.2
166 172 146
3 3.1 3
_________________________
'02 Chev Corvette ZO6: TGMO 0W-20/M1 0W-40, 6:1, HTHSV 2.72, VI 212
'12 Chev Cruze Eco 1.4T MT: M1 0W-30 AFE

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#3114671 - 09/04/13 01:51 PM Re: 10w30 vs 5w30 [Re: larryn]
HTSS_TR Offline


Registered: 04/17/06
Posts: 12901
Loc: Irvine, CA
Of the 3 M1 xW30 grades, looks like 5W30 is thinnest at starting temperature (at least in So Cal), but it's thickest at operating temperature.
_________________________
'94 LS400
'00 E430
'04 S2000
"Consumerism has accustomed us to waste. But throwing food away is like stealing it from the poor and hungry" Pop Francis

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#3115040 - 09/04/13 07:30 PM Re: 10w30 vs 5w30 [Re: jimmy87]
gfh77665 Offline


Registered: 09/01/08
Posts: 2289
Loc: Southeast Texas
Originally Posted By: jimmy87
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?


Opposite corner of the State. Near Beaumont TX.

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#3115046 - 09/04/13 07:38 PM Re: 10w30 vs 5w30 [Re: Jim Allen]
gfh77665 Offline


Registered: 09/01/08
Posts: 2289
Loc: Southeast Texas
Originally Posted By: Jim Allen
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.


I am not sure about the ears reference, but, as far as I can tell, any pressure difference is beyond the sensitivity of the stock gauge. I think it reads pretty well, as it responds quickly during acceleration, etc. So, if it is too small to register, for all intents and purposes, I say “no change” in pressure. I would note I was watching for it, too. I was a bit hesitant to experiment at first, but am glad now that I did. My truck starts, runs, sounds and performs the same as it always did with 5-30 or 10-30.

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#3115154 - 09/04/13 08:53 PM Re: 10w30 vs 5w30 [Re: Blue_Angel]
Clevy Offline


Registered: 11/11/10
Posts: 7215
Loc: Saskatoon canada
Originally Posted By: Blue_Angel
Mobil 1 @ 100C, 40C, VI, 150C (Canada):

SN SN SN
0W-30 5W-30 10W-30
10.9 11 10.1
62.9 61.7 63.2
166 172 146
3 3.1 3



Where exactly are we finding M1 0w-30 in Canada?
_________________________
2006 Charger RT
Miles x 2 per oil filter

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#3115441 - 09/05/13 06:59 AM Re: 10w30 vs 5w30 [Re: gfh77665]
Jim Allen Offline


Registered: 08/12/05
Posts: 4477
Loc: NW Ohio

Originally Posted By: Jim Allen

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


I grew up with Star Trek in the '60s... "You were so worried about his Vulcan eyes that you forgot about his Vulcan ears!" Referring to Spock's super sensitive hearing. I forget not everyone is as gray as I am.

Originally Posted By: gfh77665

I am not sure about the ears reference, but, as far as I can tell, any pressure difference is beyond the sensitivity of the stock gauge. I think it reads pretty well, as it responds quickly during acceleration, etc. So, if it is too small to register, for all intents and purposes, I say “no change” in pressure. I would note I was watching for it, too. I was a bit hesitant to experiment at first, but am glad now that I did. My truck starts, runs, sounds and performs the same as it always did with 5-30 or 10-30.



As to the rest, I reserve judgement because essentially you are asking me to believe the sky is green. The oil phenomenon I described is universal physics. I wouldn't think the truck runs any differently but you can bet your oil filter is in bypass a lot more... which is not something to be glad about IMO. Especially since there is no benefit to running an oil that thick if not dictated by circumstances.

I'm all for free, so I understand why you are using it. I might be tempted too. I'm only gnawing on this because you are trying to make it sound optimal... and it's far from it.


Edited by Jim Allen (09/05/13 07:00 AM)
_________________________
Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive

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#3115605 - 09/05/13 10:08 AM Re: 10w30 vs 5w30 [Re: larryn]
wally6934 Offline


Registered: 02/18/12
Posts: 308
Loc: Wi
If you have been running the 40WT for a few oil changes a UOA would be interesting. I would expect to see high levels of wear metals.

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#3116103 - 09/05/13 07:39 PM Re: 10w30 vs 5w30 [Re: Jim Allen]
gfh77665 Offline


Registered: 09/01/08
Posts: 2289
Loc: Southeast Texas
Originally Posted By: Jim Allen

essentially you are asking me to believe the sky is green..... oil that thick if not dictated by circumstances.

I'm only gnawing on this because you are trying to make it sound optimal... and it's far from it.


I am offering a anecdotal commentary of an experience of mine, nothing more. I do want to say "for the record" I am definitley not advocating 40 for the masses. I have no reason to. In TX, with 100 degree temps and 100% highway (minimal cold starts) the 40 is working well for me.

Yes, in an analytical sense, it is thicker and causing higher oil pressure. In a real world sense, no perceptible difference. It not "optimal", but it is definitly OK. I will not use it in the winter, nor in a newer car like my 06' Honda.

The sky is blue, my truck is running well, and I know who Spock is.

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#3116138 - 09/05/13 07:58 PM Re: 10w30 vs 5w30 [Re: gfh77665]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 3546
Loc: Cajun Country, La.
Originally Posted By: gfh77665
Originally Posted By: Jim Allen

essentially you are asking me to believe the sky is green..... oil that thick if not dictated by circumstances.

I'm only gnawing on this because you are trying to make it sound optimal... and it's far from it.


I am offering a anecdotal commentary of an experience of mine, nothing more. I do want to say "for the record" I am definitley not advocating 40 for the masses. I have no reason to. In TX, with 100 degree temps and 100% highway (minimal cold starts) the 40 is working well for me.

Yes, in an analytical sense, it is thicker and causing higher oil pressure. In a real world sense, no perceptible difference. It not "optimal", but it is definitly OK. I will not use it in the winter, nor in a newer car like my 06' Honda.

The sky is blue, my truck is running well, and I know who Spock is.

But, your Honda can go as many OCIs on the same filter as you want. hide
_________________________
2007 F150 XL, 4.2 V6
"One Filter, One OCI!"
Formula Shell 5W20, MC FL-400S

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#3116142 - 09/05/13 08:02 PM Re: 10w30 vs 5w30 [Re: larryn]
Clevy Offline


Registered: 11/11/10
Posts: 7215
Loc: Saskatoon canada
Jim has made a very valid point. The oil filter would be in by-pass at start up without a doubt,which sends unfiltered oil through the engine until the oil is hot enough and thin enough to be filtered.
Now if one could find a filter with a higher by-pass psi to run in this situation then that would lessen or stop the by-pass event from taking place.
We all know that even a 0w is too thick at start up,and a by-pass event can take place with oem rated filters if rpm are even slightly elevated,until the oil is up to operating temp.
This is why diesel filters tend to have higher psi by-pass ratings. They tend to require 10w and 15w oils specified from the oem and when cold these oils are hard to pump,so the by-pass is built for more psi to insure the oil passes through the filter.
Yes I'm sure the engine is running fine with a straight 40 grade oil and honestly if the engine ran continuous without shutting off its likely ideal however its far from optimal and I expect that there is much more start up wear occurring which may affect the longevity of the engine as a whole.
I think the rings are experiencing more wear simply because there would be absolutely no oil splashing on the cylinder walls for at least 90-120 seconds,until the oil is thin enough to splash up there.
Other than the rings the rest of the engine likely has enough of a film to not experience too much extra wear,but don't fool yourself there will be elevated wear.
_________________________
2006 Charger RT
Miles x 2 per oil filter

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#3116172 - 09/05/13 08:31 PM Re: 10w30 vs 5w30 [Re: Clevy]
wally6934 Offline


Registered: 02/18/12
Posts: 308
Loc: Wi
Originally Posted By: Clevy
Jim has made a very valid point. The oil filter would be in by-pass at start up without a doubt,which sends unfiltered oil through the engine until the oil is hot enough and thin enough to be filtered.
Now if one could find a filter with a higher by-pass psi to run in this situation then that would lessen or stop the by-pass event from taking place.


I do not pretend to be the oil system expert but i think this is the way it works. When the oil goes in to bypass it is because the oil is many times too thick to go through the oil filter media. Raising the by-pass pressure 5 or 10 PSI is not going to be the differance of oil suddenly going thru the filter, especially at 10 GPM. In the meantime, the pressure of the bypass valve subtracts from the total amount of oil pressure of the system. If you have a 60 PSI oil pump and your system is in bypass mode and opening up a 15 PSI bypass valve then your remaining oil pressure to the engine is 45 PSI. So raising the bypass pressure will actually lower the oil pressure to the engine, when the engine is cold.

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#3116178 - 09/05/13 08:32 PM Re: 10w30 vs 5w30 [Re: wally6934]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 3546
Loc: Cajun Country, La.
If my engine specs 5W20 can I use 5W30? hornets grin
_________________________
2007 F150 XL, 4.2 V6
"One Filter, One OCI!"
Formula Shell 5W20, MC FL-400S

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#3116206 - 09/05/13 09:00 PM Re: 10w30 vs 5w30 [Re: BlueOvalFitter]
wally6934 Offline


Registered: 02/18/12
Posts: 308
Loc: Wi
Originally Posted By: BlueOvalFitter
If my engine specs 5W20 can I use 5W30? hornets grin


Considering all of the people who routinely run one grade higher than is spec'd for their engine and proclaim they have no problems, i would say yes you can. And i suspect just about everyone on this board will agree with me.

The only debate here is if the engine is run until it dies how many miles would you have gotten from 5W20 and from 5W30. I do not think the question can or ever will be answered.

Some of the conditions you would have to take in account.
Climate.
The way you drive.
How much weight you carry around.
The type of oil used.
Short trips / long trips.
And probably the specific engine model.

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#3116218 - 09/05/13 09:08 PM Re: 10w30 vs 5w30 [Re: wally6934]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 3546
Loc: Cajun Country, La.
Originally Posted By: wally6934
Originally Posted By: BlueOvalFitter
If my engine specs 5W20 can I use 5W30? hornets grin


Considering all of the people who routinely run one grade higher than is spec'd for their engine and proclaim they have no problems, i would say yes you can. And i suspect just about everyone on this board will agree with me.

The only debate here is if the engine is run until it dies how many miles would you have gotten from 5W20 and from 5W30. I do not think the question can or ever will be answered.

Some of the conditions you would have to take in account.
Climate.
The way you drive.
How much weight you carry around.
The type of oil used.
Short trips / long trips.
And probably the specific engine model.

Wally, no offense to you, very good reply though, but this Q? I asked was supposed to be humorous. Why? It has been BEATEN TO DEATH so bad all that is left of the beaten horse is dust. horse repost
But, as you see in my signature, I DO use 5W30 in my 5W20 spec'd engine. Why? Because this engines clearances and tolerances have NEVER been changed since it was spec'd for 5W30 in 1996. And, the 5W20 Gods here are very bothered by me using 5W30! LOL
_________________________
2007 F150 XL, 4.2 V6
"One Filter, One OCI!"
Formula Shell 5W20, MC FL-400S

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