[dpaul]

Ok, that makes sense. However, while the terms "SULEV" and "BMW emission warranty" may have some congruence, neither is a sensible "shorthand" for the other.

Federal standards mandating warranty replacement for emission system components have been in effect since at least the mid 1990's, way before SULEV or PZEV notions were conceived. Such standards have been expanded over time by both federal and state (most famously, California) agencies. CARB legislation has had a huge impact and as the you've pointed out, CARB standards have been adopted by many although not all states.

Although this discussion has been quite confusing to me, your comments raise a really important issue. Both service providers and consumers are frequently unaware that variety of components qualify for replacement under existing emission warranties. I believe you are correct that turbos are included among the components covered under BMW emission warranties applying to both SULEV and non-SULEV engines