Getting ready for my 15,000 mile service. Going to change the diff fluid (front and back), trans, and engine oil/filter. Any advice on which products to use? I want to make sure that the products I use comply with Dodge's specs in the owners manual. I have been thinking about syncthectics for the diffs and trans. Do guys think this is a good idea? Also how about the transfer case? Do I change its fluid too?

Last question...do I change the fluid myself or let the dealer do it. I am not shy about using a wrench by any means. Where do I get a service manual for these rigs?

Okay...enough questions. Thanks for the help.

 

Amsoil! Do it yourself - it is cheaper. I am in no way affiliated or a dealer. I have just experienced a world of difference when I switched from Mobil 1 in my current pickup. I love it. But, then again, my current p/u has been off warranty for sometime. If I had a new pickup, after break-in, I'd still switch to Amsoil.......I'm a believer! Run it in almost every motorized piece of whatever I have now.

 

Go with Royal Purple, it is API certified which is required by both Dodge and Cummins for your warranty, Amsoil is not API certified, because Amsoil puts so much additives into their oils that it will not pass API certified tests.

 

And were did this info come from?

 

Amsoil is not API certified, because Amsoil puts so much additives into their oils that it will not pass API certified tests

First off, look at the XL oils and then you'll see your statement is incorrect...Enough said!

Frt & Rear Ends: Redline, Valvoline, Mobil 1, Royal Purple 75w-90 gear oil (use the regular stuff with additive in it instead of the NS versions-may help prevent or get rid of rear end chatter from stop sign. Yes, I know this flies in the face of the DC recommendation that the rear ends don't need the additive because of no clutch plates. But, the additive makes the rear a little slippier). Amsoil has a new Severe Gear Oil out, but never tried it.
6 Spd: Redline MTL, Pennzoil/Quakerstate Synchromesh. Do some research on Royal Purple Synchromax and you'll find it does not meet DC specs. Amsoil at one time recommended engine oil...NO WAY!
Transfer Case: Amsoil ATF or Redline C+ fluid.

 

Lots of good info in this thread.

 

I just want to read the too much additive quote in print by what testing standard,whom etc.The usual real facts. Not I heard that from the guy painting my house etc.Still LOVE the post awhile back that OFFROAD diesel had ATF in it to make it red.Neighbor and I still chuckle about that one a lot!

 

Here is a little information on one reason Amsoil can not pass API certification: http://forums.noria.com/eve/ubb.x/a/...23/r/618106496

 

I believe the real reason not all the Amsoil oils are API certified, is the cost involved for API certification, not an additive package. I suggest you send an email to Amsoil and that's the response you'll receive. You may want to not take another forums members hypothetical thoughts as gospel.

 

This one is from a thread in here: https://www.dieseltruckresource.com/...5&pagenumber=2

 

http://www.rv.net/forum/index.cfm/fu...g/14092356.cfm

Amsoil did not stand behind their product with this guy when a bearing went south.

 

I don't know if Amsoil is better or worse than API approved oils but I don't understand why they don't have their oils tested and approved so as to avoid warranty problems if a "manufacture defect" should come to pass.

Any company that even mentions the Magnuson-Moss act in their warranty disclaimer raises a red flag as big as Texas to me.