Anyone run 5w30 in there MDS engine with the MDS disabled? I see that alot of the pre mds guys are running it and I starting considering changing since Im going to be doing my next oil change in a few days...

 

Good question. The pre 06's run 5W30 because thats what they require. I would say stick with 5W20. The MDS in the hemis use solenoids to control oil pressure going to the valve lifters and therefore relies on the proper viscosity to properly collapse the lifters and disable their respective cylinders... having said all that im not sure if the lack of solenoid operation (MDS turned off) would still require that viscosity of oil. Consider your warranty as well.

Hopefully theres a MDS brain on the forum who will shed some light on this...

 

I had 6qts of Amsoil 0w-30 Signature series oil left over from my Chevy. Bought another quart and changed my oil when I got my MDS Ram. Still goes in and out fine as far as I can tell(and my mpg's on highway)

I'll be going with 0w-20 in about 500 miles.

You should be fine with 5w-30 with MDS off.

 

Chrysler is big on oil viscosity. I know for a fact a guy with an '06 and a failed cylinder (most likely caused by the cheap a$$ burning nothing but 87 octane, no-name gas) has been denied warranty repair on his truck because he was not running 5w-20 in it. Had records of the same speedy lube joint doing his oil changes every 3k like clockwork, but was using 5w-30. Now his MDS is enabled as other than a few external appearance mods and a drop-in K&N he is bone stock.
I highly doubt it was the thicker oil caused his problem, and am sure you will be fine if you choose 5w-30 especially with the MDS deleted, but if you have warranty, you might want to stick with the recommended 5w-20. Remember, Dodge first started recommending 5w-20 with the '05 Hemi which was NOT an MDS engine...

 

Hmm I still have warranty but I think its pretty much toast anyways since I do all my own oil changes.. I keep all the receipts and write in my manual when I do the oil changes but I dont think that they will let that pass if I try to go in for warranty work? Maybe Ill try the 5w30 and see if it works out, Worst case scenario I dump it and go back to 5w20, The mobil 1 5w30 is on sale now to so its not that big of a deal.

 

If you have receipts and mileage records, they HAVE TO honor your warranty for engine/oil related failures. Another virtue of the Magnuson Moss Warranty Act, they cannot force you to go to the dealer (or any other "certified" mechanic) for maintenance work...

 

Oh really, I had no idea, I just know that my brothers aftermarket warranty ford made him buy says he needs to have his oil changes done at a warranty approved facility.. Well in that case maybe I had better stick with the 5w20 just in case.. The main reason I was thinking is that with a little heavier weight oil it might get rid of that hemi tick??

 

Why does everybody want to run thicker oil?? It isn't needed. It just puts more stress on the oil pump. These engineers ain't stooopid.

 

Well im not 100% sure but its probably the same oil pump that they used in the hemis from 03 up so it really wouldnt make a difference if those ones are supposed to run 5w30

 

Tighter engine tolerances, perhaps in the bearings? I just personally don't know why anyone would want to run thicker oil. Especially in the cold winter months.