What Oil Weight
#1
Seasoned Member
Thread Starter
Join Date: Feb 2010
Location: Pharr, Texas
Posts: 272
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1989
Model: Cherokee
Engine: 4.0L
What Oil Weight
I just changed the oil on my 89 Jeep, got some Quakerstate 20W-50 and now it sounds like a diesel. Oil pressure is at 80 when it use to be 60. What oil should I put in it?
#2
#3
Honorary Moderator
Join Date: Mar 2010
Location: Gilbert AZ/Las Cruces NM
Posts: 8,135
Likes: 0
Received 13 Likes
on
11 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 upgraded
DO NOT RUN ANYTHING THAT IS HIGHER THAN AN xxW-30 the -30 at the end of the oil marking is what viscosity it is at operating temp. The reason it sounds like a diesel is because your oil is not viscous enough at operating temp.
some people run a diesel oil due to the zinc content in the oil is great for our flat tap cams.
run a 10w-30 or preferably a 0w30...
The 10w- or 0w- in front means what viscosity it is at on start up (32* industry standard). 10w is farther from the proper operating viscosity on start up, 0w is closer to operating temp viscosity on start up, providing better wear protection on start up.
It is not going to do anything to harm your engine running a 0w-30 infact it will help it. where as a 10w-40 or a 20w-50 will harm your engine.
also do not add any engine additives. They do not do your engine any good. they are a bandaid to an underlying problem.
some people run a diesel oil due to the zinc content in the oil is great for our flat tap cams.
run a 10w-30 or preferably a 0w30...
The 10w- or 0w- in front means what viscosity it is at on start up (32* industry standard). 10w is farther from the proper operating viscosity on start up, 0w is closer to operating temp viscosity on start up, providing better wear protection on start up.
It is not going to do anything to harm your engine running a 0w-30 infact it will help it. where as a 10w-40 or a 20w-50 will harm your engine.
also do not add any engine additives. They do not do your engine any good. they are a bandaid to an underlying problem.
#4
Registered Users
Join Date: Sep 2009
Location: morrisonville ny
Posts: 1,371
Likes: 0
Received 2 Likes
on
1 Post
Year: 2000 @ 1994 givin away
Model: Cherokee
Engine: 4.0
10w30 or 10w 40 oil,some guys say 15w 40 or 20w50 thats fine if your motor is wore out that much to need it,If the oil is too thick for the motor it will chatter terrible .Castrol,mobil mopar oil all good to use
Last edited by rich; 06-27-2010 at 06:48 AM.
#5
Registered Users
Join Date: Sep 2009
Location: morrisonville ny
Posts: 1,371
Likes: 0
Received 2 Likes
on
1 Post
Year: 2000 @ 1994 givin away
Model: Cherokee
Engine: 4.0
For zinc just add a can of stp oil treatment,its the same thing.(read the bottle first before you say anything stupid please).I m just saying so we dont have a post full of uninformed posts.
#7
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
Op... One of the BIG considerations for your oil weight, is your intended usage and the environment you live in.
Seeing how you live so far south, there is absolutely no reason for you to run anything with a 0W-xx. A multi-weight oil in such a viscosity is intended for folks living in the northerly climates where we see days when the starting temps are close to 0 degrees.
Yes... the 0,5,10,20,30 in front of the w is the cold weather viscosity. But its based on 0 degrees. An oil with a 10w viscosity is close to the same viscosity of a SAE 10 at 0 degrees. The advantage of this is in cold start conditions the oil flows fairly quickly. And a 10w is less viscous than a 20w oil in those conditions.
Now there are other considerations to look at. As your oil ages in the engine. Some of the additives break down and are able to do less work. Multi-weight oils(10w-30, etc.) have an additional additive class called viscosity modifiers in them. A single weight oil (SAE 30) do not carry much if any vicosity modifiers. And oils with a larger spread on the viscosity (5w-40,etc.) have a larger percentage of these additives than oils with smaller ones(5w-20). The oils with the large spreads will tend to break down more quickly due to this.
Seeing how you live so far south, there is absolutely no reason for you to run anything with a 0W-xx. A multi-weight oil in such a viscosity is intended for folks living in the northerly climates where we see days when the starting temps are close to 0 degrees.
Yes... the 0,5,10,20,30 in front of the w is the cold weather viscosity. But its based on 0 degrees. An oil with a 10w viscosity is close to the same viscosity of a SAE 10 at 0 degrees. The advantage of this is in cold start conditions the oil flows fairly quickly. And a 10w is less viscous than a 20w oil in those conditions.
Now there are other considerations to look at. As your oil ages in the engine. Some of the additives break down and are able to do less work. Multi-weight oils(10w-30, etc.) have an additional additive class called viscosity modifiers in them. A single weight oil (SAE 30) do not carry much if any vicosity modifiers. And oils with a larger spread on the viscosity (5w-40,etc.) have a larger percentage of these additives than oils with smaller ones(5w-20). The oils with the large spreads will tend to break down more quickly due to this.
Trending Topics
#8
CF Veteran
Join Date: May 2009
Location: Glen Burnie, MD
Posts: 1,844
Likes: 0
Received 3 Likes
on
3 Posts
Year: 1994
Model: Cherokee
Engine: 4.0 H.O. K&N, Borla headers, custom down pipe, magnaflow hi-flo cat, flowmaster to turn down tip
wow this thread is awesome....and at the same time way over my head. i use 10w-40. i like it the best. i live in California where it is always hot so i like the little heavier weight.
#10
CF Veteran
Join Date: Nov 2009
Location: The Republic of TEXAS
Posts: 8,172
Likes: 0
Received 14 Likes
on
14 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Read some motor oil facts, not fiction, in the above link. The lower the first number, the better it is for your engine. 80 psi is just robbing horsepower. Motor oil myths are already prevalent in this thread.
#11
Senior Member
Join Date: Apr 2009
Location: New Waverly, Tx
Posts: 954
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1997
Model: Cherokee
Engine: Used engine just put in less than 79kmiles onit jeepersCreepers 60mm TB, '99-'01 intake, BorlaHeader
http://www.supramania.com/aehaas/
Read some motor oil facts, not fiction, in the above link. The lower the first number, the better it is for your engine. 80 psi is just robbing horsepower. Motor oil myths are already prevalent in this thread.
Read some motor oil facts, not fiction, in the above link. The lower the first number, the better it is for your engine. 80 psi is just robbing horsepower. Motor oil myths are already prevalent in this thread.
Thread
Thread Starter
Forum
Replies
Last Post
Blackxj51
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
17
11-26-2015 12:04 AM
Hole Punchn Hog
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
10-07-2015 08:05 AM
jeepnewbie44312
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
24
09-28-2015 06:04 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)