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Old 03-29-2012, 05:17 AM
5500 5500 is offline
Dodge Ram Forum Member
Join Date: Mar 2012
Location: Boston, MA
Posts: 55
Gender: Male
Vehicle: 2012 Ram 1500
Trim Level: Express
Color: White
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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5500 is on a distinguished road

Not sure how MDS affects transmission operation.

Typically its cold oil viscosity thats critical to engine controls like variable valve timing and mutiple cylinder control, etc... These types of controls are managed with oil pressure and in order to have adequate pressure at colder operating temps the oil has to be thin enough to flow. Once the oil reaches operating temp, it usually thins out enough that flow isn't an issue. Thats why many manufacturers require a cold viscosity of 0 or 5. I think the hot viscosity of 20 is to hel achieve mileage figures.

I personally don't like the driveability when MDS is active, but I like the ability to defeat it. Still haven't decided if it actually saves me any fuel.
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