defender 200tdi oil

HI i like to look after my vehicles and have always used gtx magnatec in my petrol engined car,can anyone please tell me if the magnatec gtd (diesel ) version is ok to use ina defender 200tdi engine .It did make it much smoother in my current car and i hope it will make the engine a bit less noisey in my much loved defender...Ta very much MR DING DONG