Editing Cetane number (section)

== Typical values ==
Generally, diesel engines operate well with a CN from 48 to 50. Fuels with lower cetane number have longer ignition delays, requiring more time for the fuel combustion process to be completed. Hence, higher speed diesel engines operate more effectively with higher cetane number fuels.

In Europe, diesel cetane numbers were set at a minimum of 38 in 1994 and 40 in 2000. The standard for diesel sold in [[European Union]], [[Iceland]], [[Norway]] and [[Switzerland]] is defined by standard [[EN 590]]. Since 1 January 2001 EN 590 demands a minimum [[cetane index]] of 46 and a minimum cetane number of 51. Premium diesel fuel can have a cetane number as high as 60.<ref>[http://rb-k.bosch.de/en/powerconsumptionemissions/dieselsysteme/service/faqs.html bosch.de] (German) {{webarchive |url=https://web.archive.org/web/20071224213516/http://rb-k.bosch.de/en/powerconsumptionemissions/dieselsysteme/service/faqs.html |date=December 24, 2007 }}</ref>

In Finland, premium diesel fuels sold by [[filling station]] chains [[St1]] (Diesel Plus), Shell (containing GTL) and ABC (Smart Diesel) have a minimum cetane number of 60 with the typical value being at 63.<ref>{{Cite web|url=https://content.st1.fi/sites/default/files/2018-05/eb41a6d6-d5ae-4de0-a699-ea60f497f2e0.pdf|title=St1 Diesel plus -20 °C Product Data Sheet|date=2018-03-15}}</ref><ref>{{Cite web|url=https://www.shell.fi/motorists/tuotetiedot-ja-kayttoturvallisuustiedotteet/_jcr_content/par/textimage.stream/1521278305628/2cb1590505b9153dea0c19238b1adb96a10b25a5/shell-diesel-tuotetieto-20-03-2018.pdf|title=Shell Diesel Summer -20 °C Product Data Sheet|date=2018-03-15|access-date=2020-01-03|archive-date=2020-01-03|archive-url=https://web.archive.org/web/20200103172129/https://www.shell.fi/motorists/tuotetiedot-ja-kayttoturvallisuustiedotteet/_jcr_content/par/textimage.stream/1521278305628/2cb1590505b9153dea0c19238b1adb96a10b25a5/shell-diesel-tuotetieto-20-03-2018.pdf|url-status=dead}}</ref><ref>{{Cite web|url=https://www.abcasemat.fi/lataa-tiedosto/145/tuotetieto---produktdata-smart-diesel--20.pdf|title=NEOT DIESEL -10/-20, NEOT DIESEL -10/-20 Premium Smart Diesel Data Sheet|date=2018-03-15}}</ref> [[Neste]] MY [[Neste Renewable Diesel|Renewable Diesel]] sold in Finland has a minimum cetane number of 70.<ref>{{Cite web|url=https://www.neste.fi/static/datasheet_pdf/150450_en.pdf|title=Neste MY Renewable Diesel Product Data Sheet|date=2019-01-01}}</ref>

In North America, most states adopt ASTM D975 as their diesel fuel standard and the minimum cetane number is set at 40, with typical values in the 42-45 range.  Premium diesel fuel may or may not have higher cetane number depending on the supplier. Premium diesel often use [[fuel additive|additives]] to improve CN and [[lubricity]], [[detergent]]s to clean the [[fuel injector]]s and minimize [[carbon]] deposits, water dispersants, and other additives depending on geographical and seasonal needs.{{citation needed|date=January 2013}}. California diesel fuel has a minimum cetane of 53.<ref>{{cite web|url=http://www.arb.ca.gov/enf/fuels/dieselspecs.pdf|title=Specs table|website=www.arb.ca.gov|access-date=2013-06-08|archive-url=https://web.archive.org/web/20170221021415/https://www.arb.ca.gov/enf/fuels/dieselspecs.pdf|archive-date=2017-02-21|url-status=dead}}</ref> Under the Texas Low Emission Diesel (TxLED) program there are 110 counties where diesel fuel must have a cetane number of 48 or greater, or else must use an approved alternative formulation or comply with the designated alternative limits.<ref>{{cite web|url=https://www.tceq.texas.gov/airquality/mobilesource/txled/cleandiesel.html|title=Texas Low Emission Diesel (TxLED) Program|website=TCEQ}}</ref>

Neste MY Renewable Diesel sold in North America has a cetane number of 70+.<ref>{{Cite web|url=https://www.neste.us/neste-my-renewable-diesel/product-information|title=The Advantages of Neste MY Renewable Diesel (HVO or R99 Diesel)|date=2022-07-22|website=Neste in North America|language=en|access-date=2023-10-16}}</ref>