In North America you can buy an enzyme product called *Oil Eater and spray it on your cold engine then rinse with a hose. It will look like a brand new engine before oil was added and will help you find the leak pretty easily. Run your engine while parked, don't drive it so air flow won't spread it....

*Don't use on glass or HOT aluminum due to discoloration occurring.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course