[Salo]

You could be behind my volkswagen and not know it was a diesel if not for my "yes, it's a diesel" license plate frame.

Paging Dr. Huffman, Dr. Huffman, diesel thread.

having sat behind a diesel bus, there is nothing clean about diesel

[B Knotts]

Perhaps we need a diesel ping list. Heck, there's a ping list for everything else, no matter how obscure. :-)