Those issues are strictly related to DPF and it's "burning" function, burn "subtile powders" (as we call those polluters here in EU) is a difficult thing. Manufacturers are far from perfection in this specific problem.

That's why i'm so "cold" about buying a modern diesel. SA included.

My indirect and "semi-direct" experience is NEGATIVE, for many,many cars of all manufacturers .

Less costs to drive daily, more cost at shop.

 

Had a debate with a highly knowledgeable thermo/fluids/energy conv professor today. Which happens to be someone that has achieved many feats in his time.

We were talking about compression ratios in class and I brought up the SkyA-G (NA 14:1, not even the 14.5:1). I explain how it eliminates knocking even with 87 octane using the elimination of decreasing residual exhaust gas with its 4-2-1 header. Obviously included the special piston design with a cavity that perfects fuel ignition, and retarded ignition timing for optimal combustion.

I also mentioned the SkyA-D that uses similar production record technologies as the SkyA-G to achieve an insanely low compression ratio of 14:1. That includes adopting a new generation of (what I recall to be 3 stage) fuel injectors, glow plugs, and cold start assist with variable valve lift.

All in all, he found what I explained to be hard to believe. It's amazing how a small humble Japanese car manufacturer can put a mechanical engineering professor of 50 years with many international achievements in a form of awe.

 

Hopefully he went home and did some digging...

 

13:1* correction for NA market.