Motor Oil Type
#2
Senior Member
Join Date: Dec 2008
Location: Washington State
Posts: 990
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0L HO
Aww, a question with no right answer. The problem here is that each person loves a different weight and a different brand and whether it has a synthetic blend or a full synthetic or just plain old oil. It also depends on the weather, if its really cold for a long time like months and months you'll want to run a thinner viscosity oil. If its hot a thicker viscosity oil. I can tell you what I use though. The standard Valvoline 10w30. The weather stays mild here in Washington state for most of the year so I can get away with it.
#3
"CF Moderator"
Thread Starter
Join Date: Sep 2008
Location: N.J. Shore Area
Posts: 3,045
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1994
Model: Cherokee
Engine: l6 HO
Thanks for the reply, I usually use 10/30 in the winter and 10/40 in the summer myself. Was just wondering what everyone else uses, Thanks...Tj
#4
CF Veteran
Join Date: Apr 2008
Location: Northern Illinois
Posts: 2,237
Likes: 0
Received 3 Likes
on
3 Posts
Year: 90
Model: Cherokee
Engine: 4.0
As long as you are running a good quality API-SL rated oil your engine is going to be happy.
Weight is going to depend on location and your prevailing weather.
Remember when looking at a multi-viscosity oil the first number is the effective viscosity at 0 degrees.. the second the effective viscosity at operating temps.
Weight is going to depend on location and your prevailing weather.
Remember when looking at a multi-viscosity oil the first number is the effective viscosity at 0 degrees.. the second the effective viscosity at operating temps.
#7
Member
Join Date: Aug 2008
Location: Sticks, NC
Posts: 174
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
As i have for years i stick with Valvoline 10w-30. Ive used the high mileage blends in the same weight, but i cant see a difference. Change that oil every 3k and add a new filter (I use the Motorcraft FL1A) and you'll keep her purring and happy.
Trending Topics
#8
Newbie
Join Date: Jan 2009
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
Year: 95
Model: Cherokee
Engine: 4.0 with mustang injectors
i work at a shop and have tried just about everything from mobile 1, hight mileage, slick 50, 10w30, 5w30,...ect the best that i have found for a high mileage engine was 15w40 rotella T, its used in diesels, its thicker, i found out if you have any leaks(even small ones) synthetic oil will tend to leak faster because the molecules are bunched closer together, synthetic will also drain faster from you valvetrain than thicker oil, thus more noise and wear on cold starts..just my 2 cents
#10
CF Veteran
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,989
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1987
Model: Cherokee
Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator
My XJs 4.0 has 240K so I use 10W-40 get get a little more thickness. I also use a high mileage oil. Usually Castrol High Mileage.
#12
Member
Join Date: Nov 2008
Location: Colorado Springs, CO
Posts: 216
Likes: 0
Received 1 Like
on
1 Post
Year: 1998
Model: Cherokee
Engine: 4.0HO
So what is the difference in a diesel oil and others. I like the idea of a thicker oil for my XJ 4.0. There seems to be some ticking in the valves and I think maybe an oil thicker than 10W30 would help that.
#13
CF Veteran
Join Date: Oct 2008
Location: Stafford,VA
Posts: 2,543
Likes: 0
Received 5 Likes
on
5 Posts
Year: 1998
Model: Cherokee
Engine: 4.0
the diesel oil uses more Zinc........Your probally hearing the famous LIFTER Tap most of the AMC 4.0's Suffer from...(mine included) I run 10W40 Penz High milage.
#14
CF Veteran
Join Date: Apr 2008
Location: Smiths Station, Al
Posts: 7,661
Likes: 0
Received 13 Likes
on
10 Posts
Year: 87
Model: Wagoneer
Engine: 4.0 I6
EEEWwwwww get rid of the PEnz, Jeeps hate pennzoil.
Yes the rotella is one of the few oils that still has HIGH Zinc and other stuff that keeps your engine running bettter.
Great on older High mileage vehicles.
#15
Junior Member
Join Date: Dec 2008
Posts: 88
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Grand Cherokee
Engine: 4.0
I used the rotella 15/40 in my f-350. So you guys that use it in your 4.0's there hasn't been any problems with it. I'll try it if it works for you guys. We are all running the same motors here. I have about 147,000 on that zj I just got.