Reply To: P1 oil change. Welcome to the Allard Owners Club. › Forums › Technical Talk › P1 oil change. › Reply To: P1 oil change. November 26, 2022 at 3:55 pm #7471 Tim WilsonParticipant Hi, Russell: for me, always Halfords or Duckhams 20/50; it’s what l put in all my old cars. As for sump capacity, my engine is a 3.6 Ford Pilot, and l think it’s ca. 4.5ltrs. Hth, Tim.