Which option lists the engine oil pressure range for continuous operation?

Which option lists the engine oil pressure range for continuous operation?

• A. 0-40 psi
• B. 110 psi max
• C. 40-80 psi
• D. 80-110 psi

Answer: (D)

Engine oil pressure must stay within a safe operating window to ensure proper lubrication of all moving parts. During continuous operation, after the oil is warm, the pump should maintain a steady, moderate-to-high pressure that keeps bearings protected without stressing the system. A range of 80-110 psi provides that balance: pressures below about 80 psi can mean insufficient lubrication, especially as RPMs rise, leading to increased wear; pressures above about 110 psi can indicate a relief valve or regulator issue and may stress seals and hoses. The other ranges describe pressures that are too low or not representative of normal continuous operation, so the 80-110 psi range is the correct one.

Engine oil pressure must stay within a safe operating window to ensure proper lubrication of all moving parts. During continuous operation, after the oil is warm, the pump should maintain a steady, moderate-to-high pressure that keeps bearings protected without stressing the system. A range of 80-110 psi provides that balance: pressures below about 80 psi can mean insufficient lubrication, especially as RPMs rise, leading to increased wear; pressures above about 110 psi can indicate a relief valve or regulator issue and may stress seals and hoses. The other ranges describe pressures that are too low or not representative of normal continuous operation, so the 80-110 psi range is the correct one.