You can put a small amount of oil in the 5 cyl.A table spoon.
Then do a compression again on the 5 cyl. If the compression
comes up, this is a sign that you have bad rings.The oil will seal
the rings making the compression come back.
If the oil in the 5 cylinder will not bring the compression back up.
This may mean you have a valve leaking.
Use a heavy wt. oil.
You can also use compressed air in the sparkplug hole.
IF you hear air coming out the intake (throttle body), or exhaust,(tail pipe)
you have a bad valve.
If air comes out the oil fill hole or PCV valve ,the rings are bad.
randy