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  #21  
Old 02-18-2013, 06:20 PM
Asur Asur is offline
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Been finding some info that some have put 5W-30 in there Hemi's with no issues, but some have also tried some 5W-40 in the Hemi and there dash comes up with a "wrong viscosity error" light on the dash. Also found this on the Mobil 1 site

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Question: Must 5W-20 be Used in HEMI MDS Engines?Is 5W-20 still the choice grade for 5.7 HEMI MDS engines under extreme temperatures? The Owner's Manual and related TSBs all state that 5W-20 must be used whereas pre-MDS HEMIs were recommending 5W-30 and even 10W-30 for hot climates. Does 5W-20 still provide optimum protection in severe conditions above 100°?
Answer: We recommend you follow the recommendation in your vehicle's owner's manual. If you are concerned about durability due to higher temperatures, then going to a higher viscosity grade would provide a better oil film under high temperature conditions. You might also consider using Mobil 1 5W-20 fully synthetic motor oil, which will provide 5W-20 viscometrics but also provide a performance upgrade at the same time.
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  #22  
Old 02-18-2013, 06:28 PM
Red-Stripe Red-Stripe is offline
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My Ram burns more fuel in MDS 4 cylinder mode than when in normal 8 cylinder mode. I'll think I'll go out of my way to put in a 5w-30 on my oil change and test the mileage again to see if the MDS has any merits at all.
On second thought, if it stops the MDS from working, it will save me from having to put it in "6" all the time to get better mileage!

Last edited by Red-Stripe; 02-18-2013 at 06:41 PM.
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  #23  
Old 02-18-2013, 06:39 PM
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Quote:
Originally Posted by Red-Stripe View Post
My Ram burns more fuel in MDS 4 cylinder mode than when in normal 8 cylinder mode. I'll think I'll go out of my way to put in a 5w-30 on my oil change and test the mileage again to see if the MDS has any merits at all.
^^^^^^
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  #24  
Old 02-18-2013, 06:39 PM
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Quote:
Originally Posted by Asur View Post
Been finding some info that some have put 5W-30 in there Hemi's with no issues, but some have also tried some 5W-40 in the Hemi and there dash comes up with a "wrong viscosity error" light on the dash. Also found this on the Mobil 1 site

Ask Mobil 1

Question: Must 5W-20 be Used in HEMI MDS Engines?Is 5W-20 still the choice grade for 5.7 HEMI MDS engines under extreme temperatures? The Owner's Manual and related TSBs all state that 5W-20 must be used whereas pre-MDS HEMIs were recommending 5W-30 and even 10W-30 for hot climates. Does 5W-20 still provide optimum protection in severe conditions above 100°?
Answer: We recommend you follow the recommendation in your vehicle's owner's manual. If you are concerned about durability due to higher temperatures, then going to a higher viscosity grade would provide a better oil film under high temperature conditions. You might also consider using Mobil 1 5W-20 fully synthetic motor oil, which will provide 5W-20 viscometrics but also provide a performance upgrade at the same time.
Damn it, Al- you have had me reading for over 45 minutes! LOL. But anyway, this is what I was thinking. 5W-20 synthetic. Around here, 85 degrees would be hot in the summer, and in the winter, it rarely goes down below 20. Couple that with my never doing any towing or heavy hauling, and I think I'd be comfortable with the 5w-20.
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  #25  
Old 02-18-2013, 06:47 PM
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Quote:
Originally Posted by Red-Stripe View Post
My Ram burns more fuel in MDS 4 cylinder mode than when in normal 8 cylinder mode. I'll think I'll go out of my way to put in a 5w-30 on my oil change and test the mileage again to see if the MDS has any merits at all.
On second thought, if it stops the MDS from working, it will save me from having to put it in "6" all the time to get better mileage!
Like you I get better mpg with the MDS off, so basically I'll save money buying a tuner and I can switch off the MDS just buying putting in the 5W30!
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  #26  
Old 02-18-2013, 06:48 PM
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RansRam go look at my no BS real mileage results..
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  #27  
Old 02-18-2013, 06:57 PM
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Originally Posted by Red-Stripe View Post
RansRam go look at my no BS real mileage results..
Hey I don't doubt you at all I would just never put a higher weighted oil in my engine just to try and defeat something mechanical. There are easier ways to disable MDS, like putting the auto stick in "5". I have a SC tune on mine that has disabled MDS permanently and I can honestly say that my mileage is worse but that may be from the winter gas I'll know for sure once it warms up.
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  #28  
Old 02-18-2013, 06:58 PM
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this could cause your eyes to glaze over

Chrysler's reasoning for using 5w-20

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.”

MDS Hemi engines
MDS components and operation

When all criteria has been met, power is supplied to each MDS Solenoid when the engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshaft.

The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy.

The main components of the Multi Displacement System are:

Unique MDS camshaft.
Deactivating roller tappets.
4 control valves/solenoids.
control valve/solenoid wiring harness.
oil temp sensor.

Cylinder Deactivation


Trap an exhaust charge
Normal combustion event
Don’t open exhaust valve
Don’t open intake valve
Piston is an air spring
Cylinders deactivated in firing sequence

Cylinder Reactivation
Empty the cylinder
Open exhaust valve
Open intake valve
Normal combustion event
Cylinders reactivated in firing sequence
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  #29  
Old 02-18-2013, 07:10 PM
Red-Stripe Red-Stripe is offline
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Thanks, I think mine is in a constant state of "improper operation"
If it wasn't for multiple websites stating they don't aknowledge MDS operation such as mine as "abnormal" I would have brought it in for repair a long time ago. I'll definetly try a 5W30 soon. What do I have to loose? Maybe it will work as advertised.
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  #30  
Old 02-18-2013, 07:11 PM
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Default

Quote:
Originally Posted by GTyankee View Post
this could cause your eyes to glaze over

Chrysler's reasoning for using 5w-20

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.”

MDS Hemi engines
MDS components and operation

When all criteria has been met, power is supplied to each MDS Solenoid when the engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshaft.

The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy.

The main components of the Multi Displacement System are:

Unique MDS camshaft.
Deactivating roller tappets.
4 control valves/solenoids.
control valve/solenoid wiring harness.
oil temp sensor.

Cylinder Deactivation


Trap an exhaust charge
Normal combustion event
Don’t open exhaust valve
Don’t open intake valve
Piston is an air spring
Cylinders deactivated in firing sequence

Cylinder Reactivation
Empty the cylinder
Open exhaust valve
Open intake valve
Normal combustion event
Cylinders reactivated in firing sequence
And THIS is why I work on boat engines! LOL
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