i have a turbo 2000 impreza running 300+ BHP and i am changing plugs coil packs oil fillter and oil but dont know what oil is best to use can any one help me please thanks

 

Any quality fully synth such as Silkolene Pro S/R, Motul, Millers or Fuchs Titan Supersyn. If the car is just a daily driver then with your power 10W40 should be fine. If you track or drive hard most of the time then 10W50 or 15W50.