All major brands of oil are excellent lubricants. Just make sure you use the exact weight that Jeep recommends for your vehicle. The brand is your choice.
10w/40
about 20psi at idle (warm) and 40 to 50psi at 2000rpm.
Running at operating temperature around 40 psi.
A full operating temperature it will be around 40 psi.
Magnetec 10w-40 should be the best oil
CASTROL 10W/40
the best oil for a diesel is rotella t 15w 40.
Synthetic 5W - 40 , Tested and engine is smooth and best
The 40. 1997 Jeep Wrangler needs 6 quarts of oil for an oil change.
the best oil is HONDA HP TRANSMISSION OIL and the best 2 cycle engine oil is KLOTZ TECHNIPLATE and run the mixture 40:1
castrol edge 5/40
10w-40, 20w-40 & 20w-50 are best grades, Brand which i preffer is "ZIC"