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Old 12-21-2011, 02:33 PM
TNC TNC is offline
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Location: Hawley, TX
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Default MDS & Oil Viscosity

OK, I think most are aware of the recommendation about 5W-20 motor oil and the possible relation to MDS operation...or are they? We're seeing a lot of transmission and driveability complaints from people that seem to be related to the MDS and probably not really transmission related. I'm curious if some of those complaints might be connected to running the wrong oil viscosity. Those of us who change our own oil know what went into the motor. I don't think that many people change their own oil anymore, so I'm wondering...are they sure they're getting the 5W-20 recommended viscosity? Is the MDS system, especially at the lifters, really that sensitive to the 5W-20 oil vs. another viscosity? Could some of these alleged shifting and driveability issues that seem to be connected to the MDS actually be related to the wrong oil viscosity? Would the wrong oil cause an imbalance or some other performance related symptom at the lifters to result in a very noticeable MDS operation glitch? Just thinking out loud here, as I was preparing to change my new truck's oil for the first time...with 5W-20 of course...LOL!

Forgot to add, I really haven't had any issue with the MDS kicking in and out. Yes, I can feel it, but it's not particularly annoying or causing any grief...at least from my perspective. People are different, however, and some can't stand even the slightest perceived disruption in the power delivery. Some might call them anal and some might call it preference, but you have to admit that some may be a bit hypersensitive to some quirks in any vehicle's operation.

Last edited by TNC; 12-21-2011 at 02:37 PM.
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