you may want to include mileage and a bit of lifetime maintenance to help us understand how the car has lived its life.

Oil in the coolant is typically a sign of a failing head gasket, you may also want to check your oil for signs of coolant. Instead of deep black the oil will take on a frothy coffee color and be sludgy.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg