50 50 coolant is what i use- would suggest no more han a 60 40 mix.
10w/40
The engine computer is the voltage regulator.
.40
15W-40 15W-40
Running at operating temperature around 40 psi.
about 20psi at idle (warm) and 40 to 50psi at 2000rpm.
A full operating temperature it will be around 40 psi.
Sadly this is gonna require a visit to the dealer. Plan on spending $40 or so to get this done. Every Jeep from 1996 or so onward will need a dealer program to get keyless working.
castrol 10 w 40 high mileage
15 quarts of 15w-40
Around 30-40 psi when at full operating temperature. Can even be somewhat lower on a high mileage engine.