I've got a 1.8 Zetec sump on my ZVH RS Turbo, i've just noticed oil leaking out of the bottom of the sump. I thought it would be the sump bung and ring so i replaced those with new bung and copper and rubber seal. As i replaced it i noticed there had been some grey paste smeared on the edge of the sump - this seems really hard, so i suspect there is either a hole or crack in the sump. Just wondering if anyone knows what this paste is or where i could get hold of some. Cheers Rob