Hello, the motor oil (Mobil 1 New Life) which in a Mondeo Mk4 2,3l petrol tank for about 8000km and one year had been analyzed. The result was: Iron and copper slightly increased. Normal wear of copper bearing materials (lead bearings) and metal components or components. Slightly increased fuel content in the oil. Viscosity has decreased compared to the fresh oil. Viscosity is outside the limits of the SAE V valid for the specified oil type. iscosity class. The base number BN (indicator for the alkaline reserve) has decreased compared to the fresh oil. Therefore, the oil can neutralize less acids from the combustion process. All other determined data lie within the permitted or expected values. According to the data, the oil has already been changed. Iron 19mg/kg Copper 12mg/kg Aluminium 3mg/kg The vehicle with currently 98,000km is usually on short to medium distances and almost exclusively in low D rehzal range ( <4000U/min).