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  #1  
Old 05-26-2011, 08:11 PM
Ben616 Ben616 is offline
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Default Why 5w20 for hemi

Any one know if its posible to use 0w30 instead of 5w20 in the 5.7. I have been using synthetic 0w30 in all my four cycle engines for years. Gives me instant oil pressure in very cold temps and I dont have to plug things in. I have read that it has somthing to do with the MDS system. Somone else had a post here saying that a dealer put 10w30 in his truck by mistake and he had all kinds of warnings show up on the dash and has to have it changed. Anyone out there run any diferent flavor in their truck

Thanks Ben
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Old 05-26-2011, 08:13 PM
erm
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Yes...5W20 is what is spec'd as an engine oil to insure that the MDS system operates properly.

Since that is what they recommend, and the fact that I have an extended warranty, that's what I run....even though my truck does not have MDS.
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Old 05-26-2011, 08:40 PM
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Originally Posted by MADDOG View Post
Yes...5W20 is what is spec'd as an engine oil to insure that the MDS system operates properly.

Since that is what they recommend, and the fact that I have an extended warranty, that's what I run....even though my truck does not have MDS.
It's what the owners manual recommends, good enough reason for me.
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Old 05-26-2011, 08:45 PM
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oil things that i just discovered after looking at the post

I did Not know that the W meant WINTER TESTED
if the motor oil performs like a SAE 5 motor oil on the reduced temperature scale and flows like a SAE 20 at 210 F (100 C), then this motor oil's label will read 5W-20.
http://www.upmpg.com/lubricationnews..._oil_light.htm

5W-20 oil
stays at the 5 viscosity from -20oF (-29oC) to 20oF (-6.7oC) temperature
from that point on it becomes 20 viscosity
http://www.engineeringtoolbox.com/en...ts-d_1545.html

0W-20 motor oil
Mobil 1 0W-20 Advanced Fuel Economy
New Formulation; upgraded to meet and/or exceed the latest ILSAC GF-5 industry standard.
Mobil 1 0W-20 Advanced Fuel Economy is engineered to help improve fuel economy in vehicles where SAE 0W-20 or 5W-20 motor oil is recommended.
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Last edited by GTyankee; 05-26-2011 at 08:54 PM. Reason: adding another brand oil w/ 0 viscoscity
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Old 05-26-2011, 08:50 PM
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Quote:
Originally Posted by GTyankee View Post
oil things that i just discovered after looking at the post

I did Not know that the W meant WINTER TESTED
if the motor oil performs like a SAE 5 motor oil on the reduced temperature scale and flows like a SAE 20 at 210 F (100 C), then this motor oil's label will read 5W-20.
http://www.upmpg.com/lubricationnews..._oil_light.htm

5W-20 oil
stays at the 5 viscosity from -20oF (-29oC) to 20oF (-6.7oC) temperature
from that point on it becomes 20 viscosity
http://www.engineeringtoolbox.com/en...ts-d_1545.html
^^^^ Correct, this is why 0W20 is perfectly acceptable and actually better for cold weather starts.
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Old 05-26-2011, 09:01 PM
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as you see, i was still researching to see if the was such a thing as
0W-20
i edited my previous post
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Old 05-26-2011, 09:09 PM
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Quote:
Originally Posted by GTyankee View Post
as you see, i was still researching to see if the was such a thing as
0W-20
i edited my previous post
^^^^ Very good info GT !!!!!!
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Old 05-27-2011, 01:32 PM
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Default

I guess I should rephraze my question I prefer the 0w30 because I get faster oil circulation at cold temp and im talking -40 here some days and a little thicker viscosity at operating temp. Imperial oil did a study way back when they first started coming out with overhead cams. They used a 250 cumings straight six Deisel truck engine at -25C and found it was 6 to 7 minuts to get oil to the heads with fresh 15w40 and even longer with dirty oil. That can cause some wear over time. I would like to know why 5w20 for MDS if it requires a thiner oil to operate properly when cold and the viscosity is not as important when hot then 0w30 should be fine. Also if running ow30 will not harm the engine but just cause the MDS to operate less eficiently I would chose the 0w30 for beter wear protection over the MDS for fuel savings. From what I read MDS is more for EPA inspections than owner fuel savings anyway. Anyone out their a MDS expert with answers.
Thanks Ben
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