Ala Dr. Seuss rebuilding a 2.1L engine:

One seal, two seal, red seal, blue seal.
Black seal, blue seal, old seal, new seal.
This one has a little star, this one has a little scar.
Say! What a lot of seals there are!
Yes. Some are dead, some aren't true, some are old, and some just screwed.
Some are sad, some are bad, and make me very very mad
Why am I mad that they are bad, the checkbook knows and so does dad!
Some worn thin and some smashed flat, the flat one can't stay there like
that.
From there to here, from here to there, leaky things are every where.