Well, the work order kind of traps them a bit...if they say it is residual, then they really didn't clean the engine, did they?

How much is leaking?

I mean you need to bring it back of course.... stress with them that you understand sometimes this kind of thing happens, but having to return a car that was purportedly just repaired and tested is really unacceptable. You'll chalk this up to bad luck, but the issue really MUST be addressed completely and totally- and they should keep the car as long as they need to ensure that happens- with you in a nice loaner too.

GL

A