Question 120Motor Plants - QMED

The correct answer is A) Lube oil pressure. After starting a diesel engine, the first thing that should be checked is the lube oil pressure. This is critical because proper lubrication is essential for the engine's safe and reliable operation. Low lube oil pressure can indicate a problem with the lubrication system, which could lead to engine damage if not addressed promptly. The other options are not as time-sensitive. Checking exhaust temperature, lube oil level, and water level are also important, but they do not require the immediate attention that lube oil pressure does after engine startup.