There is no oil in the coolant, and no coolant in the oil....

The belching coolant does happen during cooldown, though. I suppose it could also be happening under load, but I wouldn't see it from inside the cabin.

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT