Common synthetic oils available for diesel confirm to very old specifications (API-CF). I think mobil 1 is synthetic.
I was also recommended Delo 400 (chevron). It has detergent content of 3600+ twice that of Castrol GTX or Castrol GTX diesel(API-CI oil which I use currently).
Before this I used to be on Castrol GTD and oil change was done every 6000kms or so.
So as long as you stick to or exceed API-CF specifications you should be fine.
Get Castrol GTX diesel, and if you are going synthetic I would recommend anything with rating more than API-CH (API-CH4, API-CI4)
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