Getting worn out
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Just drive it and enjoy years of reliable service. 15w40 may be too thick depending on the weather in your area, it takes longer for cold thick oil to flow to the bearings, you may be doing more harm than good. On the upside, the 15w40 is more for diesel engines and will have a bit more zinc in the oil. Zinc helps with decreasing wear to the flat tappets and cam in our Jeeps.
Last edited by Bustedback; Oct 10, 2011 at 02:55 PM.
Thread Starter
Newbie
Joined: Sep 2011
Posts: 25
Likes: 0
From: High Point NC
Year: 2000
Model: Cherokee
Engine: 4.0
Some mornings in winter it will get low to mid teens and VERY VERY seldom it will be in single digits. What oil would be good I think right now it has 10-30w in it from the PO? Also what plugs do we run in these?
CF Veteran
Joined: Oct 2011
Posts: 1,268
Likes: 1
From: Bakersfield CA
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
change the filter every 3 to 5000 add a bottle or two of oil detergent add clean oil as needed full oil change at 10 to 15000. No sludge problem no oil pressure issues no overheating. OD rolled over 421000 last week, I have 286000 on this motor.
Registered Users
Joined: Aug 2009
Posts: 791
Likes: 0
From: Ny
Year: 1995
Model: Cherokee
Engine: 4.0ho
Changing the oil every 2000-2500 miles is a waste of money and time. You will be just fine changing it every 5000 miles, mine is lucky to changed at 6000 miles. Oil pumps do not make pressure, they only make the oil flow. Low oil pressure is caused by two things, excessive bearing clearences, or something wrong at the oil pump pick up like a restriction or an air leak.
well partly, the oil pump does indeed reflect the oils pressure. If you've ever dealt with race engines (I build them) you'd know the 30 - 50 psi oil pressure a motor gets with a stock oil pump vs the same motor getting 50 - 100 psi with a high volume pump, is a common occourance with no other changes.
Yes, worn rings and bad cyl walls, along with worn bearing, will decrease oils pressure, along with changing viscositys etc.
Yes lucas is for more than just failing motors. I stand behind thier oil stabilizer, it works.
Thread Starter
Newbie
Joined: Sep 2011
Posts: 25
Likes: 0
From: High Point NC
Year: 2000
Model: Cherokee
Engine: 4.0
Originally Posted by The Blacksmith
Wrong.
well partly, the oil pump does indeed reflect the oils pressure. If you've ever dealt with race engines (I build them) you'd know the 30 - 50 psi oil pressure a motor gets with a stock oil pump vs the same motor getting 50 - 100 psi with a high volume pump, is a common occourance with no other changes.
Yes, worn rings and bad cyl walls, along with worn bearing, will decrease oils pressure, along with changing viscositys etc.
Yes lucas is for more than just failing motors. I stand behind thier oil stabilizer, it works.
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Wrong.
well partly, the oil pump does indeed reflect the oils pressure. If you've ever dealt with race engines (I build them) you'd know the 30 - 50 psi oil pressure a motor gets with a stock oil pump vs the same motor getting 50 - 100 psi with a high volume pump, is a common occourance with no other changes.
Yes, worn rings and bad cyl walls, along with worn bearing, will decrease oils pressure, along with changing viscositys etc.
Yes lucas is for more than just failing motors. I stand behind thier oil stabilizer, it works.
well partly, the oil pump does indeed reflect the oils pressure. If you've ever dealt with race engines (I build them) you'd know the 30 - 50 psi oil pressure a motor gets with a stock oil pump vs the same motor getting 50 - 100 psi with a high volume pump, is a common occourance with no other changes.
Yes, worn rings and bad cyl walls, along with worn bearing, will decrease oils pressure, along with changing viscositys etc.
Yes lucas is for more than just failing motors. I stand behind thier oil stabilizer, it works.
Thread Starter
Newbie
Joined: Sep 2011
Posts: 25
Likes: 0
From: High Point NC
Year: 2000
Model: Cherokee
Engine: 4.0
Originally Posted by LongArmXJ
change out the exhaust bearing and you will never have to change the oil again.