Dirgantara Mitra Mahardi as a principal of Altrak 1978 for Valvoline Oil Product recently participated in Gaikindo AUTO EXPO 2005. The Event was held at Jakarta Hilton Convention Center on July 8th – 17th 2005. Almost 123 brand product from derivate automotive (spare parts, tires, oils, accessories) joining the events. Showing at the events, one of Valvoline Oil Product (Premium Blue) suitable for Diesel Engine with SAE Viscosity Grade 15W – 40, API Service CF-4/SG & CI-4/SL.