White smoke is a sign of coolant, if the motor checks out fine (compression test and coolant pressure test.) i would be checking the turbo as it also has coolant flowing through it.
but given the white smoke starts after 20min i wouldnt rule out a cracked block or head as it may only leak when warm..
have you had it on boost? does this push coolant into the over flow bottle or white smoke worse?
Welcome anyway.
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