So, just what is what? It has both ci and cj, not to mention ch, cg, cf and cf/sm. What does all that mean?
It supercedes thoses other API ratings. But it does not mean it is suitable for use in a flat tappet engine. If it has CJ or "low emissions" on the bottle, it is the new emissions friendly diesel oil, which means it has the reduced additive package. Diesel oils typically had boosted Zinc levels, but they also have a high detergent package that in essence tries to clean off the anti-wear coating. Many here will tell you the use of Rotella or other diesel oils is fine. I would consider a CJ oil to be borderline. I'm not using them. Use with a roller cam or overhead cam would be OK.
For passenger car rated oils, avoid anything with SM or SN rating UNLESS it specifically calls out protection like the silver bottle of VR-1 does.
