10w/40
This is not advised. Use 10w30.
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The 40. 1997 Jeep Wrangler needs 6 quarts of oil for an oil change.
The engine computer is the voltage regulator.
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.
Use any good 15-40 W engine oil intended for motorcycles. Change oil according to the owner's manual. I would change the engine oil every 3 to 4 thousand km on this bike. For a worn engine and hot outside temperatures, a 20-40 or even single grade 40 W can be used.
50 50 coolant is what i use- would suggest no more han a 60 40 mix.
Around 30-40 psi when at full operating temperature. Can even be somewhat lower on a high mileage engine.
1990/20 ÷ 20 = 199/40 or 439/40