Will changing the oil from 5W-20 to 5W-30 damage the engine with MDS? I read on the internet that if you put in any oil heavier than 5W-20 will shut the MDS off. I just wanted to know if there is any truth to this. Thanks
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I've seen this mentioned several times here, and the caution was always to stay with the 5W20...so I do. It's my understanding that using the heavier oil will affect the MDS adversely.
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'06 QC Sport, with a hole in the roof!
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'08 Ram 1500 QC 4.7 Auto in Inferno Red, Normally get 16-18mpg, Best of 22.1 avg. mpg at 60 mph so far, 24k miles
'03 Ford Explorer Sport Trac in Redfire Metallic, 200k miles
Maybe this is where the theory comes from, but I cant imagine the switch in oil alone would trick the engine into shutting off MDS. I would think a setting in the computer would also have to change. In any case, I am sticking with the manual and using 5W-20.
__________________ 2008 Ram 1500 Big Horn Quad Cab 4x4
5.7L HEMI (MDS), 20" Aluminum Wheels, Tow Package, Popular Equipment Group, Power Heated Trailer Tow Mirrors, Inferno Red, Chrome Side Steps, K&N Filter, Rhino Lining, Chrome Bug Guard, WeatherTech Extreme Duty Floor Liners, McGard Lugs
According to the manual, the 2500/3500 (no MDS) takes 5W-30, and the 1500 (which now all have MDS) takes 5W-20.
My 4.7 has MDS?
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'08 Ram 1500 QC 4.7 Auto in Inferno Red, Normally get 16-18mpg, Best of 22.1 avg. mpg at 60 mph so far, 24k miles
'03 Ford Explorer Sport Trac in Redfire Metallic, 200k miles
5W-20 vs. 5W-30 with MDS?
