1. Launch the game "Real Oil Tanker Simulator Mania" on your mobile device.

2. Select your preferred game mode: offroad transport or city delivery missions.

3. Choose your oil tanker truck from the available models. Each has different handling and fuel capacity.

4. Use the on-screen controls or keyboard arrows (if playing on an emulator) to steer the truck.

5. Press the accelerator button to move forward and the brake button to slow down or reverse.

6. Follow the map and on-screen indicators to locate the oil refinery or loading station.

7. Park your truck precisely in the highlighted loading zone to fill the tanker with oil.

8. Once loaded, carefully drive through hills, offroad paths, or city streets to reach the delivery point.

9. Avoid collisions, sharp turns, and steep drops to keep the oil tanker intact.

10. Park the truck accurately at the destination's unloading zone to complete the mission.

11. Earn rewards and unlock higher levels and more challenging transport routes.

12. Improve your skills with each mission and try to complete deliveries in the shortest time possible without damage.