Ford Cortina Forum
I’m posting this as I don’t find much support for this online.
mk5 possibly mk4 cortina rear diff oil change requires 1 litre for 1.6 engine and 1.1litre for 2.0 engine of EP80W-90 GL5. It needs to be GL5 rather than GL4 apparently.
get the car on a level surface or up on ramps.