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Old 03-30-2010, 10:54 AM
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CanadianInfernoRed CanadianInfernoRed is offline
Dodge Ram Forum Senior Member
Join Date: Mar 2010
Location: Alberta, Canada
Posts: 111
Gender: Male
Vehicle: 2010 Ram 1500 Crew Cab 4x4
Trim Level: SLT
Color: Inferno Red
Engine: 2009-2010 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Originally Posted by Remerson228 View Post
Yes, your truck requires the use of 5W-20 for proper operation of the MDS system. The tick you hear is likely what's commonly called the "Hemi tick". They all do it. There's no need to change the oil any sooner because of the lower viscosity. The engine was designed and built to accomodate this oil. Running the 5W-30 will hamper the MDS operation.
If that is the case that the hemi 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.
2010 Dodge Ram 1500 SLT Crew Cab 4x4, 5.7L Hemi 390 hp 407 lb/ft
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