Jeep Grand Cherokee - preferred oil

bobo · Sep 17, 2005

I just arranged the sale of my stepfather's 1993 Jeep Grand Cherokee to my nephew. My stepfather had the vehicle stolen 2 years ago and no longer has the owner's manual. I saw a recent oil change sticker showing conventional 15w40 oil of some sort used.

Does that make sense? The Jeep has 81,500 miles on it and is a 4.0 litre V6 automatic.

The Jeep is going to live in the Interior of BC now and has spent all its life on the coast of BC in mild winters and not overly hot summers.

What would be a good oil to use for summers that might see 100 Fahrenheit and winters that might see minus 20-25 Fahrenheit?

The vehicle has been driven by a 78-year old man who never exceeds the speed limit and is often below it. I suspect it hasn't seen 60 mph in a year or two.

It is also probably a prime candidate for an AutoRX treatment and Chevron Techron.

ARB1977 · Sep 17, 2005

quote:

Originally posted by bobo:
I just arranged the sale of my stepfather's 1993 Jeep Grand Cherokee to my nephew. My stepfather had the vehicle stolen 2 years ago and no longer has the owner's manual. I saw a recent oil change sticker showing conventional 15w40 oil of some sort used.

Does that make sense? The Jeep has 81,500 miles on it and is a 4.0 litre V6 automatic.

The Jeep is going to live in the Interior of BC now and has spent all its life on the coast of BC in mild winters and not overly hot summers.

What would be a good oil to use for summers that might see 100 Fahrenheit and winters that might see minus 20-25 Fahrenheit?

The vehicle has been driven by a 78-year old man who never exceeds the speed limit and is often below it. I suspect it hasn't seen 60 mph in a year or two.

It is also probably a prime candidate for an AutoRX treatment and Chevron Techron.

Auotrx would be wise. While you at it change all the fluids and even flush out the auto transmission. If its a 30W oil maybe a 0W30 for the winter and 5 or 10W30 for the summer.

Eddie · Sep 17, 2005

I think you mean a 4.0 L I6 engine? Mine is still running the I6 4.0 engine at 197,000 miles on Mobil 1 10w30 and PureOne oil filters. Now that Mobil has a 10w40 I would probably use that.

bobo · Sep 17, 2005

Yes I guess it is an in-line 6, not a V6, my bad!

Perhaps Esso XD3 Extra, 0w30, PAO full synthetic would be a good choice, following an AutoRX treatment.

It strikes me that a 15W40 would not be the right choice for the cold Interior winters.

He will be checking out the fluids. The Jeep got new brakes earlier this year so I think brake fluid is OK, but I don't know about the transmission, power steering and coolant fluids.

ARB1977 · Sep 17, 2005

quote:

Originally posted by bobo:
Yes I guess it is an in-line 6, not a V6, my bad!

Perhaps Esso XD3 Extra, 0w30, PAO full synthetic would be a good choice, following an AutoRX treatment.

It strikes me that a 15W40 would not be the right choice for the cold Interior winters.

He will be checking out the fluids. The Jeep got new brakes earlier this year so I think brake fluid is OK, but I don't know about the transmission, power steering and coolant fluids.

The transmission, diffs and coolant i would change. Use autorx with conventional oil first then go to synthetic.

Blue99 · Sep 17, 2005

My favorite Jeep Cherokee 4.0L thread, run on 15w40 with 226K miles on the odometer.

http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=8;t=005956

But, yes, if you will see -20F temperatures, Esso XD 0w30 should be an excellent choice for a cold weather, jeep motor oil!

Gary Allan · Sep 17, 2005

I'd do the XD-3 0w30 for the winter and swap in the 0w-40 during the warmer months. 6 month intervals. Use the best filter you can find

Eddie · Sep 18, 2005

A truly great old engine. A mil-spec engine that will take abuse unlike any alumanum engine and that is why the military chose it.

XS650 · Sep 18, 2005

quote:

Originally posted by Eddie:
A truly great old engine. A mil-spec engine that will take abuse unlike any alumanum engine and that is why the military chose it.

Where is the military using it?

MarkC · Sep 18, 2005

Nowhere.
Some government agencies, such as the Forest Service, and local governments around here use XJ Cherokees.

Ramblin Fever · Sep 18, 2005

Just curious as to whether or not the automatic transmissions hold up just as long.

Greaser · Sep 18, 2005

I use Esso XD-3 in both my Jeeps' 4.0L engines in the 0W-40 flavor with either a Napa Gold #1515 or a Baldwin B-2 oil filter....great combo for me...and yes the Ansin-Warner (AW-4)4 speed auto is a tried and tested auto transmission, made in Japan by the same company that produces Toyota transmissions,that will last as long as the 4.0L engine with minimal care.Around here security and government agencies use XJ's also where 4x4 capability is needed...FYI 178,000km on my XJ with NO mechanical problems to date

mdocod · Sep 18, 2005

seems i have read, that these engines "like" 40 weight oils... so.. given the wide range of temps you might be seeing, a 0w40, or 5w40 would likally be your best bet. The only oils available in those weights would be good synthetics anyways... so you probably can't go wrong with eithor of those weights.

anyone have an opinion on using delvac 1 (Mobil 1 Truck and SUV) in a 4.0I6? seems to me it would be a good choice.

hounddog · Sep 18, 2005

Rural mail route carriers the 4.0 and asian Warner auto is the drivetrain of choice.Tough as old shoe leather.Is KNOWN to get the PCV system plugged up but decent techs that know this ngines can repair easily.10w30 was the factory fill and is all I ever saw used in that motor here in the south.I would like that would be the weight I'd stick with in your neck of the woods.

NewGuy · Sep 18, 2005

I just put Havoline High Mileage (10W30) in my 4.0L Jeep engine. It is very smooth and reduced some of the engine noise. I had run Delo 15W40 prior to this OCI. I would recommend one of the 10w30/5W30 High Mileage products. They are thicker than a conventional, but not as thick as a 40 weight. It will be a good compromised of performance and gas mileage, but the additive package should only help your engine.

MarkC · Sep 20, 2005

Good choice New Guy. I use the Chevron version, and am very pleased with the used oil analysis results.

99 · Sep 20, 2005

quote:

Originally posted by XS650:

quote:

Originally posted by Eddie:
A truly great old engine. A mil-spec engine that will take abuse unlike any alumanum engine and that is why the military chose it.

Click to expand...

Where is the military using it?

Overseas, but it isn't the US military though. I believe some country in the Middle East has been using our Jeep Wranglers for years now.

99 · Sep 20, 2005

quote:

Originally posted by Greaser:
and yes the Ansin-Warner (AW-4)4 speed auto is a tried and tested auto transmission, made in Japan by the same company that produces Toyota transmissions,that will last as long as the 4.0L engine with minimal care.

The 3spd TF999/32RH used until 02 or 03 is a real tough trans too. It's essentially a evolved TF904 which we all know is the baby version of the TF727.

Jim Spahr · Sep 20, 2005

Of course, the 4.0L engine is the tried and true I6 ('straight' six) that Jeep has used for years in the Cherokee and the Wrangler. However, I just read that the 2007 Wrangler will have the 3.7L V6 engine (from the Jeep Liberty) for the 'six option' and the 2.4L four cylinder (instead of the present 2.5 L four). I wonder if this 2.4 L is the same four Chrysler-Jeep uses in their Neon. While Chrysler Jeep is going from I6 to V6, GM is going from V6 to I6 in the Trailblazer/Envoy. See the 4.2L I6.

99 · Sep 21, 2005

quote:

Originally posted by XS650:

quote:

Originally posted by 99:

quote:

Originally posted by XS650:

quote:

Originally posted by Eddie:
A truly great old engine. A mil-spec engine that will take abuse unlike any alumanum engine and that is why the military chose it.

Click to expand...

Where is the military using it?

Click to expand...

Overseas, but it isn't the US military though. I believe some country in the Middle East has been using our Jeep Wranglers for years now.

Click to expand...

That wouldn't exactly make it a mil-spec engine.

He asked where the military was using it and I told him. Is is mil-spec? Who knows what requirements they have over there in that messed up part of the world. Obviously the US doesn't use it so what does it matter?

Jeep Grand Cherokee - preferred oil

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