2009 monty recommended synthetic oil

[Brent]

Or if you're willing to spend a bit more. You can use CRDi nadin on your Mazda. It's API SN rated naman.

[bayen]

Id go with any of the following:

1. Mobil delvac MX 15w40
2. Top 1 Synthetic Diesel Oil
3. Delo Gold

these oils above a bang for the buck.

[Victorb]

I recommend the following:

1. Mobil 1 USA 5w-40 esp
2. Mobil 1 USA 5w-50 TDT
3. Motul Crdi
4. Liquimoly would also be a good choice. 5w-40 or 15w-40

Good oils and assure to lessen black smoke.