Changes

take free Tesco bus from main Bus station (Dworzec PKS) to shopping center Bielany. get off, go along the Tesco (way back) to Czekoladowa street, then turn left (along the tesco), then turn right, cross the street, turn left, go under the bridge (highway), turn right, cross the field and one small entrance to the highway, you'll get to the petrol station (you have seen it from the bus). Good luck!

take free Tesco bus from main Bus station (Dworzec PKS) to shopping center Bielany. get off, go along the Tesco (way back) to Czekoladowa street, then turn left (along the tesco), then turn right, cross the street, go stright across the field (don't go under the bridge) and one small entrance to the highway, you'll get to the petrol station. Good luck!