The phrase "seal leak" means that there is a problem with a seal or closure, and it is allowing something (such as a liquid or gas) to escape or leak out.
Sentences with «seal leak»
A rear main seal leaking on this engine is very common. (yourmechanic.com)
That explains the random nature of the lean codes as movement, heat, and expansion would sometimes seal the leak there. (mechanics.stackexchange.com)
Who wants this when you taken your truck in for a warranty oil pan seal leak? (dealerrater.com)