The engine oil that came with the new car is thinner than the regular oil. Cars at the end of the assembly line are tested at high rpm to measure torque and evaluate engine performance and to evaluate wheel alignment should there be a need for adjustment. But when you buy the car, they RECOMMEND you avoid frequent hard acceleration, avoid carrying or pulling heavy loads and avoid high no load engine speed at least until after the first 3000 mile (5000 km) where they "supposedly" check the drained engine oil for solids suspended in the oil and listen/observe the engine for abnormal noise and vibration. You as the owner have the right to abuse your car. When it breaks, the dealership shop verifies whether the malfunction or damage was caused by abuse, neglect or defect in engineering, materials or workmanship. Afterall, you bought the car. It is beyond warranty if the owner so desires to destroy the car once he pays for it.