in all honesty, do you really think the trader would put a bright yellow sponge in there just to stop a leak,oil,water etc...and then sell it with it still in.

and people are going on about the trader checking the car over etc...did you not check the car over before you bought it.

and if you did check it over....why did you not find it then.......

seems to me it would be hard to see and thats why the trader did not see it.

just because you are stripping the car down you spotted it.