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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 03-30-2010, 02:07 PM
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Default 5w20 oil

Why does the hemi with mds needs 5w20 for the mds to work why is it that hemi's with mds outside of North America call for 5w30. These are the same engines with the only exception that in North America we rely on CAFE standards and it is proven that 5w20 improves fuel economy marginally. The unknown part is the effect on the engines longevity.
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Old 03-30-2010, 02:42 PM
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A technical service bulletin (TSB) - 09-015-04 and 09-013-04 - says: “Vehicles with the Multiple Displacement System must use SAE 5W-20 oil. Failure to do so may result in improper operation of the MDS.”

Oddly, the new Hemi appears to use 5W20 motor oil - a specification which is expected to be widely adopted, but which is still not widely available. (In the Magnum R/T and 300C, 10W30 is recommended.)

the 2500 & up Rams don't have the MDS
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Old 03-30-2010, 02:58 PM
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Quote:
Originally Posted by GTyankee View Post
A technical service bulletin (TSB) - 09-015-04 and 09-013-04 - says: “Vehicles with the Multiple Displacement System must use SAE 5W-20 oil. Failure to do so may result in improper operation of the MDS.”

Oddly, the new Hemi appears to use 5W20 motor oil - a specification which is expected to be widely adopted, but which is still not widely available. (In the Magnum R/T and 300C, 10W30 is recommended.)

the 2500 & up Rams don't have the MDS
I understand that 5w20 oil is recommended in north america ... but let say in Australia for example the recommended oil for the 5.7 hemi with mds is 5w30. These engines are made exactly the same so why is there the difference?
please see link for reference
Austrialia Chrysler 300C specs
http://www.chrysler.com.au/300c/feat...nce/index.html

Austrailia 300C forum
http://www.***************/forums/au...d-quality.html
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Old 03-30-2010, 03:11 PM
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if you reread the 2nd paragraph, it reads

the new Hemi appears to use 5W20 motor oil - a specification which is expected to be widely adopted, but which is still not widely available. (In the Magnum R/T and 300C, 10W30 is recommended.)
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Old 03-30-2010, 03:19 PM
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right it is expected to be widely adopted but since it isn't could you not conclude that if 5w30 is recommended for a 5.7 HEMI with MDS in Australia with no adverse effects ... then theoretically you could use 5w30 in North America and have no adverse effects as well.
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Old 03-30-2010, 05:35 PM
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I actually just read this in my owners manual today. The 5w20 is SUPPOSED to be better for starting in adverse weather conditions. What worries me is that on my 2007 with 5.7 hemi. The oil fill cap says 5w 30. Is it possible that this is a replacement cap? If not why would my truck require different oil than other 2007 1500's with the 5.7? I am not really sure. I am planning on switching over to synthetic at my next oil change in 1500 miles or so anyway. Not really sure if I helped or not.

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Old 03-30-2010, 06:59 PM
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This is what does not make any sense ... other parts of the world the recommended oil for the hemi with MDS is 5w30 (see my previous link) but here in North America we are confined to 5w20 but only for certain years?
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Old 03-30-2010, 07:41 PM
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Higher average temperatures can better deal with thicker oil?
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Old 03-30-2010, 07:51 PM
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This is just a crazy theory of mine, based on no actual fact other than personal experience.

Having lived all over the world, I have experienced all kinds of weather, but North America by far, has the greatest swing in seasonal temperatures and weather (except certain southern states), I can theorize that in countries such as Australia which do not have the extreme temperature swings (it stays hot all the time ) that a lower weight oil is not required to function in cold-start conditions.

Now, engines with the MDS system (in NOrth America) are recommended to use 5W-20 since the density and viscocity varies less over a wider temperature range than a heavier oil does; which is important since you want a relatively constant oil pressure to activate the hydraulic rollers. In situations where you have high temperatures, like Australia, having a thicker oil would be more beneficial since it thins out at higher temperatures and would result in a more stable density/viscocity.

Just a crazy theory from a guy who had fluid dynamics pounded into his head
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Old 03-31-2010, 08:22 AM
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Quote:
Originally Posted by CdnoilRAM View Post
This is just a crazy theory of mine, based on no actual fact other than personal experience.

Having lived all over the world, I have experienced all kinds of weather, but North America by far, has the greatest swing in seasonal temperatures and weather (except certain southern states), I can theorize that in countries such as Australia which do not have the extreme temperature swings (it stays hot all the time ) that a lower weight oil is not required to function in cold-start conditions.

Now, engines with the MDS system (in NOrth America) are recommended to use 5W-20 since the density and viscocity varies less over a wider temperature range than a heavier oil does; which is important since you want a relatively constant oil pressure to activate the hydraulic rollers. In situations where you have high temperatures, like Australia, having a thicker oil would be more beneficial since it thins out at higher temperatures and would result in a more stable density/viscocity.

Just a crazy theory from a guy who had fluid dynamics pounded into his head
+1 ^^^^ I totally agree !!!!


When cold, the 5W-20 and 5W-30, OR 5w-40, should flow the same. The last number, when higher, flows slower (thicker) at operating temp.
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