Re: One surprise...
"because most of them rattle like a bag of nails when idling."
That "rattle" is actually a sonic boom and it's mostly a product of IDI systems which haven't existed for years.
Modern diesels are surprisingly quiet.
No comment about NOX - except to say that the USA has been hard on it for years due to its contributions to smog creation, whilst the EU had no standards on it until very recently. (Only eurodiesel 5 and later meet US NOX standards - and it now appears they may have been fibbing)
Biting the hand that feeds IT
