Better year round oil re: 10w30 vs. 5w30?

[KC_admin]

hmmmmmm...

I am getting the impression it really doesn't matter between the two grades at the climate conditions I am seeing.

 

[Drew99GT]

quote:

---

Originally posted by BlazerLT:
5w30 will be better and will be easier to pump and will get to the top end faster than even a 10w30 at your temperatures.

---

Your joking, right?

At the temperatures that this engine will see (ie Houston), GC would probably be THICKER (this is a 0w30 we're talkin bout) than Mobil 1 10-30 for chripes sake, at least for 3 out of 4 seasons.

GC 0w30 cSt 40c=68.5 cSt 100c=12.2

M1 10w30 cSt 40c=62 cSt 100c=10

I advocate 10w30 for Houston's climate.

 

[mechtech]

I use M1 0-30. Yeah, I know - someone's uncle Ed ran stright 50W in Michigan and never had a problem.
Why compromise cold start oil flow at all? There is no disadvantage, only benefit, to a lower cold crank viscosity.

 

[Al]

Flip a coin. But seriously I'm with pscholte. Oils are pretty shear stable; and even if it shears down a bit..its not much of a big deal. I used to think that 10W oils were the best way to go but no longer.

 

[oilyriser]

0w30 saves time during oil changes, because it pours out of the bottle so fast.

 

[Drew99GT]

quote:

---

Originally posted by mechtech:
I use M1 0-30. Yeah, I know - someone's uncle Ed ran stright 50W in Michigan and never had a problem.
Why compromise cold start oil flow at all? There is no disadvantage, only benefit, to a lower cold crank viscosity.

---

Not necessarily if you compare viscosites at various temps with the expected ambient temps in your area. A 5w-40 at 5 in the morning in Houston in the summer will be thicker than Mobil 1 10w30 by a fair margin. 0w/5w doesn't always mean thinner at startup during the summer.

 

[Bryanccfshr]

quote:

---

Originally posted by oilyriser:
0w30 saves time during oil changes, because it pours out of the bottle so fast.

---

LOL>.But it's it's true! Even in the far far south.

 

[Bryanccfshr]

quote:

---

Originally posted by Drew99GT:

quote:

---

Originally posted by mechtech:
I use M1 0-30. Yeah, I know - someone's uncle Ed ran stright 50W in Michigan and never had a problem.
Why compromise cold start oil flow at all? There is no disadvantage, only benefit, to a lower cold crank viscosity.

---

Not necessarily if you compare viscosites at various temps with the expected ambient temps in your area. A 5w-40 at 5 in the morning in Houston in the summer will be thicker than Mobil 1 10w30 by a fair margin. 0w/5w doesn't always mean thinner at startup during the summer.

---

I don't pay much attention to start up viscosity. I choose based on operating viscosity. In many cases the 5w and ow versions have better HTHS and a higher viscosity at operating temperature. I see 10w oils being left on the tell end of developemnt on newer formulations.

I would still use a 10w if I found a good deal on it although for the most part on the oils I have looked at I liked the 5w and 0w versions better.

 

[Drew99GT]

Please don't tell me your saying that 0w/5w oils have a higher HT/HS than 10w/15w/20w oils! On average, 10w30 will have a higher HT/HS than 5w30 and so on. Look at data sheets! If you want higher HT/HS, Motorcraft 5w30 ain't your oil at only 2.9 cp.

 

[Drew99GT]

I guess I should clarify that my "fear" of using 5w30 type oils in summer is essentially only for dino oils. With synthetic, "it's all good"! I'd still sleep better at night with 10w30, even synthetic.

 

[TallPaul]

quote:

---

Originally posted by Drew99GT:
I'd still sleep better at night with 10w30, even synthetic.

---

Me too.

 

[Bryanccfshr]

quote:

---

Originally posted by Drew99GT:
Please don't tell me your saying that 0w/5w oils have a higher HT/HS than 10w/15w/20w oils! On average, 10w30 will have a higher HT/HS than 5w30 and so on. Look at data sheets! If you want higher HT/HS, Motorcraft 5w30 ain't your oil at only 2.9 cp.

---

That's exactley what I am saying. Most 0w30's are going to be better oils than there 10w30 contemporaries.

You want to compare Amsoil's 0w30's to their 10w30's? How about Castrol??
How about this?? https://www.valvoline-technology.co...85256ae300727d2b85256f8100736087?OpenDocument
Sure the 10w has waht 2&2/3%less Noack volatality?? Not much difference in the big scheme of things. I can hardly tell what makes them different. They are very very close.

basing a decision on 0w,5w or 10w. for my climate is really irellevant. In many cases the 0w and 5w's are more advanced than the 10w's. I would even consider a straight weight in some automotive applications.
Look at the Motorcraft(conoco phillips) you brought up for example. The 10w30 is not nearly as good an oil as the 5w30. Were still waiting for the 10w30 to update as Conoco Phillips has promised. When it does I look forward to seeing the 10w30's specs. At this time I am moving away from the MC do to availability and fior the same price at AZ (2.39) I can often find better oils.


As far as Shear stability goes how much do the average car need? I am actually running the thinner oil(M10w30) in my lower revving larger displacement engine and will be putting the valvo maxlife synthetic in my higher revving variable valving(well a two valve speed like honda)four cylinder machine that gets many miles of high speed highway use. Now to be honest even though the differences on the specs is slight I would have picked the 10w30 first just out of old fashioned perception. But when you examine the differences we are discussing minute differences in todays formulations and sometimes drastic improvemtns in performance that don't follow the linear thinking of less spread is better.

 

[Drew99GT]

quote:

---

Originally posted by Bryanccfshr:

Now to be honest even though the differences on the specs is slight I would have picked the 10w30 first just out of old fashioned perception. But when you examine the differences we are discussing minute differences in todays formulations and sometimes drastic improvemtns in performance that don't follow the linear thinking of less spread is better.

---

Whelp, I guess we'll just have to agree to disagree. I guess I just can't get the old adage that "less spread is better" outa my head, but I use only dinos now for the most part. I agree that with synthetics, it's basically a moot point, but for dinos, I still think there is some sliver of value to going with 10w30 for summer.

 

[Bryanccfshr]

I agree, with conventionals that depend entirely on Viscosity improvers to make a spread it is a good rule. There just aren't many of those left.

 

[TC]

A quick Google check indicates that the average January low temp for Houston is 40F. Chevron lists a safe low working temp for 0F (zero degrees F) for 10w. So this confirms the obvious -- a 5w lube is not REQUIRED for where you live.

M1 5w30 has an HTHS of 3.08, while M1 10-30 has an HTHS of 3.17. Seems a no-brainer: They'd both work fine, but go with 10w30.

 

[mikemc]

Given your Texas climate and lack of cold winters, 10w30 would be my choice.

 

[TallPaul]

And if it is 10w30 Mobil One, might as well toss in a quart of M1 15w50 to make it a thicker 10w30.

 

[blupupher]

Mobil 1 0w30 is thicker than 10w30 (by 0.3).

Funny thing is I asked a similar thing a while back about using GC in Houston (I was worried about the 0W), and everyone said use it with no problems (which I did, and no problems).

 

[mechtech]

KC originally wanted to know which "?"W - 30 oil to use.
I just can't see a reason to use one with a thicker cold rating.
This is 2005, now.