Fuel additives

[tezmil1]

Hi all I have just got a 2013 forester diesel and used millers fuel additive in my last car, this kept my fuel injectors really clean and emissions were lower at mot than before use so I thought I would do the same in the subaru.

However I have spotted in the manual that it tells not to use any fuel additives at all, just wondered if anyone knew any reason for this please,

 

Thanks  Terry.