Due to Oil lines tend to wear with age, vibration, road debris and poor oil quality. Oil lines should be inspected regularly and replaced at the first signs of leaking. So we production new production engine oil lin for 1975-1983 Porsche 911 3.0 and 1975-1977 Porsche 911 930 3.0L Turbo. This pipe connects from oil crossover pipe to external thermostat. Sold Individually. 1 Necessary Per Car.