Engine consuming oil question
#16
Junior Member
Joined: Jun 2012
Posts: 46
Likes: 0
From: Springfield Mo
Year: 1990
Model: Cherokee
Engine: 4.0
260k miles and counting, i use castrol 20/50 year round
as for your missiing oil, the only weakness in a 4.0 is the rear main seal. if that is leaking itll be near the transmission housing. also make sure you have a good vacume seal on the line running to your valve cover. the one closest to the radiator. if that gets messed up you will leak oil from just about everywhere eventually
as for your missiing oil, the only weakness in a 4.0 is the rear main seal. if that is leaking itll be near the transmission housing. also make sure you have a good vacume seal on the line running to your valve cover. the one closest to the radiator. if that gets messed up you will leak oil from just about everywhere eventually
#17
CF Veteran
Joined: Jun 2011
Posts: 1,023
Likes: 1
From: Southern Idaho
Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
260k miles and counting, i use castrol 20/50 year round
as for your missiing oil, the only weakness in a 4.0 is the rear main seal. if that is leaking itll be near the transmission housing. also make sure you have a good vacume seal on the line running to your valve cover. the one closest to the radiator. if that gets messed up you will leak oil from just about everywhere eventually
as for your missiing oil, the only weakness in a 4.0 is the rear main seal. if that is leaking itll be near the transmission housing. also make sure you have a good vacume seal on the line running to your valve cover. the one closest to the radiator. if that gets messed up you will leak oil from just about everywhere eventually
#19
CF Veteran
Joined: Jun 2011
Posts: 1,023
Likes: 1
From: Southern Idaho
Year: 1994
Model: Cherokee
Engine: 4.0 L/242 CID I-6 High Output MFI
#20
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 11
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
#21
Junior Member
Joined: Jun 2012
Posts: 46
Likes: 0
From: Springfield Mo
Year: 1990
Model: Cherokee
Engine: 4.0
sorry if ive thread jacked..wasnt intentional
#22
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 11
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
There is one thing to remember. Oil pressure is resistance to flow.
If you have a lot of volume/movement, but the idle and running pressure is lower, that means you are getting a better flow and cooler oil to the bearings, etc.
Hot idle PSI should be around 13, while you only need 10 PSI for every 1,000 RPMs.
I used to think that high oil pressure was good, but not any more. It's kind of like high blood pressure.
If you have a lot of volume/movement, but the idle and running pressure is lower, that means you are getting a better flow and cooler oil to the bearings, etc.
Hot idle PSI should be around 13, while you only need 10 PSI for every 1,000 RPMs.
I used to think that high oil pressure was good, but not any more. It's kind of like high blood pressure.
#24
depending on youre oil change intervals i wouldnt worry about a quart. any more than that and i would start investigating... but you can check for leaks anyways, probably find some oil on the bottom of the oil pan, around the rear main seal and around the oil filter adapter.
mine has very slight leaks at the front crank seal, rear main seal, and oil filter adapter. leaks about a 1/4 quart every 5k
mine has very slight leaks at the front crank seal, rear main seal, and oil filter adapter. leaks about a 1/4 quart every 5k
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