Source: The Detroit News
quote: and that particulate matter isn't really a big deal.
quote: economical low engine speeds mean exhaust gases don't get hot enough to burn off the particulate matter--leading to clogged filters and expensive replacements.
quote: So any diesel smell you noticed, is from the 1980's and 1990's diesels that are still going strong.
quote: Modern clean diesels are *cleaner* than gasoline engines
quote: The problem is that diesels output more particulates than gasoline engines.