A 1995 4.0L holds six quarts.
CASTROL 10W/40
5 Qts. I suggest 10W-40
10w/40
Minimum spec at a warm idle is about 12psi. Normal is about 30 at idle. Should go 40-60 at 3000 rpm.
Around 60-70 lbs cold, 35-40 lbs at normal operating temperture, and 15-30 lbs warm at idle.
This is not advised. Use 10w30.
Should be between 20 and 40 psi at idle
40 psi plus or minus 540 psi plus or minus 5
Have you changed your oil lately? You can try adding 10/40 wt. oil the next time you change oil.
A full operating temperature it will be around 40 psi.
40 psi plus or minus 5
Sounds like the switch/sensor is bad. Often the guage sensor and warning light sensor are different.