What's the best type/weight of oil?

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Oct 18, 2022 | 11:22 PM

#16

IJM

CF Veteran

Joined: Jan 2014

Posts: 1,533

Likes: 349

From: District of Columbia

Year: 1998

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by cruiser54

Rotella 15-40 is great for nearly all climates!! 0 to 100!!

15w is a bit heavy for 0°F cold startups, no?

Oct 19, 2022 | 06:42 AM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Not according to the factory chart I posted above!! It's all we used at the dealership for the 13 years I was there. It gets down to 0* here.

Oct 19, 2022 | 08:40 AM

#18

vindex963

Junior Member

Joined: Mar 2022

Posts: 36

Likes: 5

From: Payson AZ

Year: 1995

Model: Grand Cherokee (ZJ)

Engine: 4.0L

Quote:

Originally Posted by 92SmokyCherokee

First off, if this has already been discussed a billion times, I'm sorry, but the search function on this forum doesn't work very well.

Google search like this: cherokeeforum.com: best oil
You will get much better results searching like this.

Oct 19, 2022 | 09:05 AM

#19

IJM

CF Veteran

Joined: Jan 2014

Posts: 1,533

Likes: 349

From: District of Columbia

Year: 1998

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by cruiser54

Not according to the factory chart I posted above!! It's all we used at the dealership for the 13 years I was there. It gets down to 0* here.

I'm confused. Your chart, which I think is the same as in my '98 manual, says 10w for temps down to 0°F, but then you recommended 15w Rotella for the same minimum temp use.

Quote:

30*F to 100*F+ 20W-40 or 20W-50
0*F to 100*F+ 10W-30 or 10W-40
-20*F to 60*F 5W-30

Last edited by IJM; Oct 19, 2022 at 10:09 AM.

Oct 19, 2022 | 11:03 AM

#20

robsjeep

CF Veteran

Joined: Dec 2017

Posts: 1,519

Likes: 411

From: San Mateo, CA

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0 Renix, stock.

Quote:

Originally Posted by 92SmokyCherokee

MY jeep definitely burns oil, so I guess my cat is screwed lol

You need two types of cats. A test passing cat, and a hollowed out cat.

Oct 21, 2022 | 09:20 PM

#21

disdam

Newbie

Joined: Mar 2022

Posts: 10

Likes: 2

From: Edge of Nowhere

Year: 92

Model: Cherokee (XJ)

Engine: 4.0

I use 10w-30 conventional, whatever brand is on sale (including store brands) and I religiously change it every 3000. Why? Because the manual told me to.

I also add some Marvel Mystery Oil sometimes. Why? It makes me feel like I'm doing something.

In summer, I switch to 10w-40. Why? A mechanic I trust said it's okay.

I have more than 300k on mine and - thankfully - it runs great.