What steps should you take when performing an oil change to ensure proper lubrication and leak prevention?

• A. Warm engine; drain fully; replace filter with correct type and torque; fill with correct level and grade; run engine to operate and check for leaks; recheck oil level.
• B. Cool engine before draining; leave filter in place; fill oil to top.
• C. Skip changing the filter to save time.
• D. Use the wrong grade oil to speed measurement.

Answer: (A)

During an oil change, you want to ensure you remove the old contaminants, provide clean filtration, and maintain proper lubrication and sealing. Start by warming the engine so the oil becomes less viscous and pours out more completely, which helps you drain as much old oil as possible. Drain the oil fully to avoid leaving used oil in the sump, which can carry contaminants into the new oil.

Replace the filter with the correct type for the engine and tighten to the specified torque. A proper seal prevents leaks and ensures the new oil will be filtered effectively from the moment you start the engine. Then fill with the correct oil grade and quantity, bringing the level to the manufacturer's recommended mark. Using the right grade ensures the oil viscosity supports proper lubrication and oil pressure under operating conditions.

Run the engine long enough for the oil to circulate and the system to reach normal pressure, then inspect for leaks around the filter and drain plug. If no leaks are present, recheck the oil level after the engine has cooled slightly and settled, and top up if necessary. This final check confirms the correct amount and helps prevent low oil level or overfill issues.

The other options fall short because cooling before draining makes the oil thicker and harder to drain, leaving more old oil behind; leaving the filter in place during drainage won’t remove old oil from the filter path and can miss filtration issues; skipping the filter allows contaminants to circulate with the new oil; and using the wrong oil grade can compromise lubrication, viscosity, and engine protection.