Hello fans , my 90’s scorpio with 2.0 l dohc 120 hp has 250000 km without any problems down , but needs since about 20000 km strongly rising oil-currently almost 2l to 1000km ; think that valve shaft seals have to be changed ;does anyone have experience ? read in my workshop book that the hydroplugs have to be renewed . Does that mean and why ? can you pull down the valve springs with universal lever or do you need Ford special tool . Does this with built-in head and compressed air via spark plug bore or better head decrease ? Thanks for help fourfan