Handy if you have an old British car with cruddy engine..................
I have a 3ltr tin of Gunk............. lasted 10yrs so far. Only really use it for cleaning the collected crud around the front sprocket on R-1 and SX, and if a car or van drops oil in the road.
I reckon that quantity will see you out, Steve..................
(might be okay in the dishwasher with bike parts, though....
)