Amsoil, which Oil should i run in my 6.4?

[ThirdCoastStroker]

Im going to switch over to synthetic Amsoil, but im wondering which oil i should be running, because the site shows 3 different oils for my truck, right now i run regular rotella 15w-40

I will be running this stuff 10k mile intervals im just not sure what the diff. is in between the 3


OE-15W-40
AMSOIL - AMSOIL OE 15W-40 Synthetic Diesel Oil (OED)
Premium 15W-40
AMSOIL Premium API CJ-4 Synthetic 15W-40 Diesel Oil (DME)
Premium 5W-40
AMSOIL Premium API CJ-4 Synthetic 5W-40 Diesel Oil (DEO)

[Saabeh]

Well, they're all CJ-4 so basically it is how much you want to spend.

You could probably run a longer change interval with the more expensive oils and their filters. But all that is up to you.

You're in Texas, so I am assuming you don't need an oil that is easier to start in the cold? If that's the case, go for the Premium 15w-40.

[ThirdCoastStroker]

yup, no cold weather down here, we are lucky if it gets below 30 maybe 2 days a year.

[Saabeh]

Originally Posted by ThirdCoastStroker

yup, no cold weather down here, we are lucky if it gets below 30 maybe 2 days a year.

Go for the 15w-40 then, you should see no problems. I pretty sure the 5w-40 is more expensive because it's more difficult to make.

[ThirdCoastStroker]

5w 40 is just a lighter oil for easier starting in the cold?

[Saabeh]

Originally Posted by ThirdCoastStroker

5w 40 is just a lighter oil for easier starting in the cold?

From what I can gather, practically. 5w-40 should provide the same lubrication as 15w-40 but at a broader temperature spectrum.

[PolarBear]

I haven't had any experience with the Amsoil 15w40 yet but recently put the 5w40 in my 01 7.3 for the first time. I love it, was running Valvoline Extreme Blue 5w40 before and thought it was nice. It was almost night and day right after putting the Amsoil in that truck, hard to explain how it felt but I think the truck was much happier also. I know some will say that's BS and changing oil brands isn't going to be noticeable and thats fine. But I was impressed and will also be putting the Amsoil in my 6.4 next oil change also. The 15w40 would probably work good for you as was said since you don't see the colder temps that some places do. Missouri winters and extreme cold starts are all that persuaded me into the 5w40.

[BIG RED BUBBA]

ive got amsoil in my engine, just dont remember which one it is, it is whatever is recommended for these trucks, 15 40 i think. i wish i could put amsoil in the tranny as well

[sanman28]

I think im going to run the 5w40 amsoil this next change. Fall and winter are fast approaching.

[Term3]

The dealer I go to puts in Mobile Delvac 1 synthetic oil summer and winter. Up her we go from +30 to -30C.