Supply of diesel fuel meeting quality requirements according to Polish Standard PN-EN 590 for high-pressure diesel engines, with deliveries scheduled to be approximately 2,100 m³, including transportation, additives compatible with engine oils, and ensuring microbiological cleanliness and resistance to contamination, with monthly orders up to 150 m³ and individual deliveries around 30 m³, to be made within 48 hours of order placement during regular hours and 24 hours in emergencies, excluding weekends.