Just found out today about the 'light duty' diesel emissions testing, when I called my usual shop for inspection. I have a '77 240D that I don't run in the winter, so it's still puffing out some winter congestion. I was told to run it hard before taking it in. One of the shops I called told me that (a) earlier model years are exempt (but they couldn't define 'earlier'), and (b) there are different tolerances for older model cars. One more way for RI to collect revenue? Probably. I believe it's still only a one-year sticker.

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-Elizabeth.
1977 240D