5W-20 and outside temps, how hot is to hot?

[-SyN-]

My new 2014 5.7L calls for 5W-20.
I live in Oklahoma where summer temps can get up to 115*F
Winter months can get down to a bit below 0*F

Ram calls for 5W-20 due to the MDS system. Which shuts off 4 cylinders at certain times. They say this system will not work properly with any oil other then 5W-20. Is this B/S? I have no clue.

My first oil change I poured in 5Qts M1 AFE 0W-20 & 2Qts M1 0W-40. The 5.7L runs and idles Awesome!!!

Last weekend we had 106*F Temps! Highway driving @ 69mph for 2 hours. Oil Temp never rose over 220*F! Oil psi was at 53 the whole time. Idle it dropped to 51 psi.

I am very anal on this temp matter and will keep close eye on this the whole summer. The 5.7L now has 1300 miles on her and I have NO Worries at all about using 0W-20 & 0W-40 year round.

Winter Time! I might go with 5Qts AFE 0W-20 & 2Qts M1 EP 0W-20

 

[deven]

Thinner oils dissipate heat faster/better than thicker oils so it would actually work better in hotter climates in theory.

 

[wemay]

Originally Posted By: crazyoildude
but the oil cap still says 5w20 correct me if im wrong..


Correct, 5w20 is what's on the oil cap. I am sure either viscosity will work since they are both mentioned in the OM.

 

[jrustles]

Originally Posted By: deven
Thinner oils dissipate heat faster/better than thicker oils so it would actually work better in hotter climates in theory.


I've seen this gem before. Can you elaborate?

 

[rikstaker]

the same engine is specd for 5w30 and even 0w40 in countries like saudi arabia, u.a.e singapore etc.

 

[Shannow]

Originally Posted By: jrustles
Originally Posted By: deven
Thinner oils dissipate heat faster/better than thicker oils so it would actually work better in hotter climates in theory.


I've seen this gem before. Can you elaborate?


I keep asking the same question...it appears that it's now BITOG lore amongst those who "want to beleive" rather than understand science...

 

[wemay]

BTW, both local dealerships say they use 5w30 as bulk. Each advising more due to convenience than anything else since all Hyundai list 5w30 as acceptable. Of coarse this was coming from whomever was answering the phone at the time.

 

[deven]

Originally Posted By: Shannow
Originally Posted By: jrustles
Originally Posted By: deven
Thinner oils dissipate heat faster/better than thicker oils so it would actually work better in hotter climates in theory.


I've seen this gem before. Can you elaborate?


I keep asking the same question...it appears that it's now BITOG lore amongst those who "want to beleive" rather than understand science...

Let me elaborate! Thicker oils can hold more heat but because thinner oils tend to flow better they channel and remove heat faster from an area.

 

[SHOZ]

I've got a 2010 Genesis Coupe 2L turbo . The oil cap says 5w20 but I think it just came from Hyundai's generic parts bin as it is the same on as on my 2008 Accent.

Hyundai bumped up the HP on the Gen Coupe engines in 2013 and installed a water to oil heat exchanger on the turbo motor. Hyundai is also a big seller in the Mid East where 120F temps are the norm.

That being said Hyundai uses the minimum as far as radiators go. The 2013 2L got an upgrade to the V6 radiator but it is still too small for performance driving. I put a Ford oil to water heat exchanger on my 2010 and a bigger radiator. This completely solved the oil and coolant temp issues.

Here's the oil viscosity charts for the Genesis Coupes.

2010-2012

2013-2014

 

[Shannow]

Originally Posted By: deven
Originally Posted By: Shannow
Originally Posted By: jrustles
Originally Posted By: deven
Thinner oils dissipate heat faster/better than thicker oils so it would actually work better in hotter climates in theory.


I've seen this gem before. Can you elaborate?


I keep asking the same question...it appears that it's now BITOG lore amongst those who "want to beleive" rather than understand science...

Let me elaborate! Thicker oils can hold more heat but because thinner oils tend to flow better they channel and remove heat faster from an area.


In an internl combustion engine, where the flow rate is fixed ?

How do they "flow bettr" ?

And where do they put the heat that they channel and remove "better" ?

Heat can only flow from hot to cold, and the ambient is the cold sink, so surely, you are implying that the sump metal temperatures, and by guilt, the sump oil temperatures are higher with thinner oils...

 

[SHOZ]

FWIW other than the radiation off the metal components to the atmosphere most of the oils heat is removed by the coolant through the radiator. This is why the oil to coolant heat exchangers and a good sized radiator are great.

 

[Mach1Owner]

Why not just run 0w30 or 5w30?

Then you are set for both cold winter and hit summer.

 

[Ram01]

But why most engines run so much smoother with 5w30 than the recommend 5w20 or 0w20 motor oil ????

 

[SHOZ]

Originally Posted By: Ram01
But why most engines run so much smoother with 5w30 than the recommend 5w20 or 0w20 motor oil ????


That's debatable. I like the 0w20 in my Accent. Can't see any reason to use anything else as the price is the same.

 

[Mach1Owner]

Thicker oil leads to less room for vibrations and friction and sound doesn't travel through it as well so it also leads to more muffled sounds.


That's my guess, I could be wrong.

 

[SHOZ]

My fuel injectors make more noise than the engine. And the GDI engines are 10x worse.

 

[Clevy]

Originally Posted By: Ram01
But why most engines run so much smoother with 5w30 than the recommend 5w20 or 0w20 motor oil ????



Huh.



Not quite

 

[Merkava_4]

It's 103F outside today and 10w30 is THIN at that temperature. I don't even wanna know what 5W-20 is at that temperature because I'm sure it would be disturbing.

 

[SHOZ]

Originally Posted By: Merkava_4
It's 103F outside today and 10w30 is THIN at that temperature. I don't even wanna know what 5W-20 is at that temperature because I'm sure it would be disturbing.


Just think, if your oil temp only got to 103F your motor would not last long as it would never drive off the water and gas.

Compare it at 200F like it is suppose to be used at.

 

[Mach1Owner]

Originally Posted By: Merkava_4
It's 103F outside today and 10w30 is THIN at that temperature. I don't even wanna know what 5W-20 is at that temperature because I'm sure it would be disturbing.

I never understood things like this, doesn't it get hotter than that IN you running engine?