4.0 you only loose 2-3 mpg with the 4.0 and you gain alot of extra power
40 Psi
WD-40
The 40. 1997 Jeep Wrangler needs 6 quarts of oil for an oil change.
35 to 40 psi
a little WD 40 should do the trick
10w/40
I put 10 w 40 in my 97 4.0 liter wrangler now it sounds diffrent. I think it should have had 10 w30 . Manual calls for 10w30
On metric gauge 2.5 to 3 bar, about 40 to 45 psi. At least 15 psi, 25 psi would be better, 40 psi on a good engine.
The engine computer is the voltage regulator.
30-40 depending on what the computer has your gpm's at if the light comes on save yourself the embarrassment and start looking.
Running at operating temperature around 40 psi.
about 20psi at idle (warm) and 40 to 50psi at 2000rpm.