The first things are.
What replacement gaskets are they using. The genuine one is they only one to use as the flash aftermarket ones are terrible and nearly always blow again. I alway use new head bolts as well. Some re-use them but I would not risk it myself as they stretch.
The head and or block need to be checked and possibly resurfaced to ensure they are totally flat.
Never put inhibitor in after a gasket change, untill it has done a few hundred Ks at. It is bugger for finding gaps.
Is the water pump buggered or the radiator clogged?
The 300tdi can be prone to head gasket and head failure but nearly always due to overheating. If its not been cooked each time then its your parts or poor workmanship.


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even if you factor in an engine rebuild.

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