The oil pressure for a 1997 GMC Sierra with a 5.0L engine typically ranges between 25 to 65 psi (pounds per square inch) when the engine is at operating temperature. At idle, the pressure may drop to around 10-15 psi, which is considered acceptable. It's important to check the owner's manual or service specifications for precise values, as variations can occur based on engine condition and oil viscosity.
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