Read the following text and answer the questions.
How to Change Engine Oil
Materials Needed:
Engine oil
Oil filter
Oil pan
Wrench
Funnel
Steps:
1. Park the vehicle on a level surface and turn off the engine.
2. Place the oil pan under the engine and remove the drain plug using a wrench.
3. Let the old oil drain completely into the oil pan.
4. Remove the old oil filter and replace it with a new one.
5. Tighten the drain plug and pour the new engine oil using a funnel.
6. Check the oil level with a dipstick and ensure there are no leaks
What is the first step in changing the engine oil?