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Yeah its not hard to do at all. The CRD motors are a bit harder, more fidly than anything.

Ah yeah. Coupla stubbies mate and its done. Scamming you for sure if he's just blocking the EGR. Its simple. Remove the intercooler, on the RHS of the motor, a cast pipe come up from the EGR valve,...

Tell him to block the EGR. Its a five minute job. If that works then great! Cheap fix.

Pouring coolant in, but not pushing exhaust gas into the coolant. I suppose anything can happen though.

For the EGR itself to be leaking, is rare. The cast body of the EGR would physically need to be cracked and therefor pushing exhaust gases into the crack and into the cooling system. Unlikely in my...