Last week my dealer replace head gasket on my 1997 c280 as goodwill (55,000 miles ), everything was wipe clean of old oil including the undercarrige. today I saw some oil on the undercarrige. I told the dealer about this they said to bring it back but, before I take it back I like to know if anybody have any helpful hint for me to tell the dealer where to find the leaks coming from. because I hate to see them redo the entire work again.

Thanks

john

1997 c280
1995 accord