Hi I have 1.8 8v cavalier MK3 with aw 50-40le auto gearbox. I need to do an oil change as it's dirty but need to know how much it takes as some sites say 3 l with out filter and some say 6l. It has to be done via dipstick hole as it a sealed box so only will do a basic change. Does anyone have this box that can advise. A rust free car with 96000 from new and original radio cassette. Thanks I'm