Look up on the internet on how to use Dawn Dish Soap to make a mix like kids use to make bubbles.
My Wife uses 1 gallon of water to 1 cup of dawn dish soap to make the bubble mix for a whole class of preschoolers.

You put it into one of those pump sprayers and the Engine needs to be cold and you spray it all over the areas you think might be leaking and start the Engine and rev the Engine and look for bubbles coming out of the leaking area. Note that the shop I used to work for used the same method and it works.

Be sure to spray the wrinkled tube after the turbo and the down pipes.

It won't work on a hot engine.

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84 300D, 82 Volvo 244Gl Diesel