There are many running 40wt oil with no MDS issues & no noticable mpg drop as well ...
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Survival stories are the most groundless source of argument.
I’m not trying to argue for or against really. The viscosity is so nominal between the two the benefits require long term scientific studies and I’m certainly not the guy to know which way or what on that. I’m just trying to present logic.
It wasn’t me saying that, but rather Ram
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.”
It’s the Way it was designed. That IS fact. This is why some people are getting success at MDS nonfunction (cheapo turn off) by using oil only. All I am saying is that more than likely none of you are engine engineers and even more than likely don’t have the specs of the 5.7 mds engine. So you really have NO idea if using a higher viscosity oil will/could cause faulty mds uniformly? What if only one valve but not the others? Could that create non uniform wear on the cam? If it wipes it out in a Day sure we wouldn’t be having this discussion, but what if the effects exponentially compound over 10 years when it should last 30? Etc.
Just trying to point out, that sure some could survive. Usually, moving to the 30wt does in fact cause a 1 to 3 mpg loss because it is in fact more oil windage. The most logical method to me is to simply pay a small fee, and deactivate mds and then do what ever oil you want. To me, it seems the least “gambling” method. But that’s Me.
However. I am also arguing that if a 20wt meets lubrication standards, why go thicker when thickness Will cause more windage and more friction and be outside what the valves, pushrods, pump -everything was designed for.?
Just my two cents from a stranger to other strangers.