thicker oil long term in a jeep 4.0.

Pennzoil motor oil
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ryan2022

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My Jeep has low miles, and I'd like to keep it for a long time.

I know that the 4.0's are quite durable. Its not that I'm concerned that using the amsoil thats in it now wont give it a long life,

I was just wondering if any 4.0 owners out there that have run a 40 weight oil or and hdeo have LESS valvtrain noise after having run the thicker or more stout oil over the long run.

The amsoil XL is great, the engine just seems a bit noisier. I'm sure its doing fine in there, I just cant help but think that with this old tech motor, some old oil ideas might come into play.

Any thoughts? the problem is, I've got the winter to deal wtih. we see -20 C and sometimes colder, so synthetic is usually a must for anything above a 5w30.
 
I run 5W30 in winter and switch to SAE30 or 10W40 for the spring/summer/fall wheeling season. I suppose the engines (2.5L &4.0L) are slightly louder on 5W30, but I don't think it's going to make a difference. If you really want to increase the viscosity for piece of mind, run the aforementioned 0W40.
 
Quote:
I was just wondering if any 4.0 owners out there that have run a 40 weight oil or and hdeo have LESS valvtrain noise after having run the thicker or more stout oil over the long run.


I don't think there will ever be a quiet 4.0/2.5. It's not something you can lubricate out. I think the static noise of the thing will trump any acoustic differences. Then again, I can be going tone deaf.
 
If you use a strait 40 in that engine you are asking for problems thick is not always better everyone on here has a different opinion and thats fine with me too but 40w is way too thick for that 4.0 you may get away with the 10w40 but why not use the grade the engine maker tells you too? When we rebuild engines here in our engine shop we always tell everyone to use the oil weight that the car was designed for most of the time..
We just finished rebuilding one of the best v8's out there because the person that ownes that engine did not listen and use the 5w20.. He thought it would be better to use 20w50 and a bottle of oil thickener and you know what he was rite! it was better for us because we profited off his thinking... (he had a slight knock in that engine at 18,000 miles from the 20w50 and we told him to stop using such a thick oil but he knew better and that my friend is why we had to replace all his bearings and cut the crank
 
thanks guys,

well I'm going to leave the amsoil in for the remainder of the OCI then make a descision.

what are your thoughts on this stuff as a comprimise?

http://www.amsoil.com/catalog.aspx?GroupID=172

I like the added zinc, but was a bit concerned about the api sl rating vs the current sm rating. Its an old engine design so it probably does not matter.

The cold flow properties would make it a good all year round oil. Not sure about mpg changes though.

I'm an amsoil dealer, so I can get it for a good price.
 
HDD is what I'm running in my wife's 4.0. I'll have it in there for a year ...maybe it will make 15k.
 
I've been running 5w-40 for about 80,000 miles at 6,000 mile intervals. I think it's the perfect combo for the 4.0.

Best: Delvac 1
Great: Mobil 1 Turbo Diesel Truck
Good: Shell Rotella T
 
Honestly, ALL of Amsoil's oils are so well formulated, you could run almost any of them and be fine, even in the middle of winter. Even the 15W and 20W oils have great crank and pour values.

That said, I would look at running the 'AMO' 10W-40 PAO oil. It has better cold-weather numbers than the XL 10W-40 you mentioned, and is more robust.
 
Just my .02, I use Maxlife in my 4.0l 92 Cherokee. 5w30 in winter, 10w30 in summer. Tried synthetics in it at one point, but it just didn't run as smooth. I am a synthetic fan, and use them in my other 4 banger applications, but the Jeep just seemed to prefer the Maxlife blend from what my butt dyno could tell. Maxlife is great oil, and thicker than most for the old workhorse. Jeep runs great and never any weird noises. Really like that oil for a 5k OCI in this engine.
 
Originally Posted By: addyguy
Honestly, ALL of Amsoil's oils are so well formulated, you could run almost any of them and be fine, even in the middle of winter. Even the 15W and 20W oils have great crank and pour values.

That said, I would look at running the 'AMO' 10W-40 PAO oil. It has better cold-weather numbers than the XL 10W-40 you mentioned, and is more robust.


thanks guys,

addyguy, this is what I was thinking too, its seems to be the best of all worlds, and has better cold properties than the euro 5w40. Plus it has extra zinc.

ryan
 
I see you are from Peterborough (Ontario).I'm thinking why not go with Esso XD-3 HDEO in the 0w30 or 0w-40 flavor?I've been running that oil in both my Jeeps for years now with great used oil analysis to back it up.
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Yeah the esso oils are great for this climate.

Because I'm an Amsoil dealer, I was trying to stick with something I could get for a good price.
 
Originally Posted By: GameOver
I've been running 5w-40 for about 80,000 miles at 6,000 mile intervals. I think it's the perfect combo for the 4.0.

Best: Delvac 1
Great: Mobil 1 Turbo Diesel Truck
Good: Shell Rotella T




x2.

the 4.0L will run happily on just about anything, but seems to be the happiest on a heavy duty oil.

whatever you do, change it regularly and i guarantee that motor will outlast the rest of the Heep
 
I am currently running the Amsoil Signature Series 0w30 100% Synthetic Motor Oil in my Jeep's 4.0 as I wanted to give it a try.

I have run both the Amsoil 10W30 & 5W30 for several Northern winters with no issues. To be honest I could not tell any difference when cold starting on the below 0 days.

I think I will stick with the Amsoil Signature Series 0W-30.
 
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