What is the correct procedure for checking engine oil level using the dipstick?

1. Check while driving at 50 km/h on a highway
2. Park on level ground, ensure the engine is off and cool, withdraw dipstick, wipe clean, reinsert fully, withdraw again, and check level is between MIN and MAX marks
3. Check immediately with the engine running at high idle
4. Add two liters of oil before checking the dipstick level