i just went through this too, and decided i did not after all have a blown gasket, but rather a leaking seal in my turbo.

it was pointed out to me that a coolant leak test kit is $50 or so, much less than the cost of getting at the head gasket, so i bought the kit and found no hydrocarbons in my coolant. crisis averted, sort of.

anyway, there are 11 out of 12 tests left in the kit if you would like to be its next owner.

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'77 240D, 504H, OM617.952, etc.