well.. does the cap look like this?
inside the cap is a caramelised colour... sorta like chocolate thickshake
compression i think should be anywhere between 160-180 evenly across all cylinders
i.e. 180 175 172 182 etc
not 180 160 180 180 that means problem in one cylinder
but get the idea?
(and i know i'm missing 2 cylinders lol)