Crude oil comes in hundreds of different varieties or "grades". These grades are valued differently by refiners based on their crude qualities.

There are a wide variety of different properties that are used to distinguish between crude grades. These are detailed in a chemical analysis of the crude called a crude assay.

The most common characteristics used to identify the quality of a crude are its API gravity and its sulfur content. The highest valued crude grades are typically those with high API gravity and low sulfur content. These are referred to as "light-sweet crudes". At the opposite end of the spectrum are the grades with low API gravity and high sulfur content, which are referred to as "heavy-sour crudes".

Some of the more common crude oil grades with regular price assessments can be found below:

Name API %S Country

Abu Attifel 43.3 0.05 Libya

Agbami 47.2 0.05 Nigeria

Akpo 45.8 0.07 Nigeria

Al Shaheen 30.3 1.90 Qatar

Alba 53.0 0.02 Equatorial Guinea

Albacora Leste 20.0 0.59 Brazil

Albian Heavy 19.6 2.40 Canada

Algerian Condensate 68.7 0.001 Algeria

Al-Jurf 30.2 1.90 Libya

Alvheim 34.9 0.17 Norway

Amenam 40.8 0.09 Nigeria

Amna 37.0 0.17 Libya

ANS 31.4 0.96 US

Antan blend 29.2 0.30 Nigeria

Arab Extra Light 40.0 1.09 Saudi Arabia

Arab Heavy 28.0 2.80 Saudi Arabia

Arab Light 33.0 1.77 Saudi Arabia

Arab Medium 31.0 2.55 Saudi Arabia

Arab Super Light 51.0 0.09 Saudi Arabia

Ardjuna 37.0 0.09 Indonesia

Asgard 52.0 0.14 Norway

Attaka 43.0 0.09 Indonesia

Azadegan 32.0 Iran

Azeri Light 34.9 0.55 Azerbaijan

Bach Ho 39.0 0.04 Vietnam

Bakken 42.1 0.18 US

Balder 30.1 0.48 Norway

Banoco 31.8 2.45 Bahrain

Basrah Heavy 23.6 4.20 Iraq

Basrah Light 30.0 2.92 Iraq

Bayu-Undan 55.9 0.007 Australia

BCF-17 16.5 2.53 Venezuela

Belanak 47.8 0.02 Indonesia

Belayim 25.3 2.47 Egypt

Belida 45.0 0.02 Indonesia

Bintulu 56.2 0.05 Malaysia

Bonga 29.4 0.25 Nigeria

Bonito 33.5 1.32 Brazil

Bonny Light 34.5 0.14 Nigeria

Boscan 10.1 4.80 Venezuela

Bouri 25.9 Libya

Bow River 24.7 2.10 Canada

Brass River 36.5 0.13 Nigeria

Brega 42.0 0.22 Libya

Brent 37.9 0.45 UK

BTC 36.6 0.16 Azerbaijan

Cabinda 32.5 0.13 Angola

Cambay 43.8 0.04 India

Cano Limon 29.1 0.50 Colombia

Captain 19.2 0.70 UK

Castilla 18.8 1.97 Colombia

Ceiba 30.1 0.42 Equatorial Guinea

Cepu 32.0 0.15 Indonesia

Champion 28.0 0.12 Brunei

Changqing 49.0 0.20 China

Cheleken 35.0 0.15 Indonesia

Cinta 32.7 0.12 Indonesia

CJ Blend 35.7 0.10 Nigeria

Clair 23.7 0.44 UK

Cold Lake 19.9 3.25 Canada

Cossack 48.0 0.04 Australia

CPC blend 46.6 0.55 Kazakhstan

Cusiana 44.1 0.11 Colombia

Dalia 23.7 0.49 Angola

Daqing 32.7 0.10 China

Dar 26.4 0.12 Sudan

Das 39.2 1.30 UAE

Djeno 27.6 0.34 Rep Congo

Doba 25.1 0.08 Chad

Dorood 32.8 2.90 Iran

Draugen 39.9 0.15 Norway

Dubai 31.0 2.04 UAE

DUC 33.5 0.25 Denmark

Dukhan 41.1 1.22 Qatar

Duri 21.5 0.20 Indonesia

EA Blend 30.5 0.11 Nigeria

Eagle Ford 45.0 0.20 US

Egina 27.3 0.17 Nigeria

Ekofisk 37.5 0.23 Norway

El-Sharara 42.1 0.07 Egypt

Enfield 22.0 0.12 Australia

Eocene 18.7 3.97 Neutral Zone

Erha 33.7 0.18 Nigeria

Es Sider 36.2 0.49 Libya

Escalante 24.1 0.19 Argentina

Escravos 34.0 0.15 Nigeria

ESPO 36.0 0.50 Russia

Eugene Island 36.0 1.20 US

Flotta 36.9 0.82 UK

Foinaven 26.8 0.37 UK

Forcados 30.0 0.15 Nigeria

Foroozan blend 30.1 2.31 Iran

Forties 40.3 0.56 UK

Frade 18.0 0.72 Brazil

Gimboa 25.3 0.56 Angola

Gippsland 48.0 0.10 Australia

Girassol 31.0 0.33 Angola

Grane 27.5 0.64 Norway

Griffin 5.0 0.03 Australia

Gullfaks 36.2 0.26 Norway

Hamaca 26.0 1.55 Venezuela

Handil 33.8 0.07 Indonesia

Hebron 20.4 0.79 Canada

Heidrun 25.0 0.52 Norway

Hibernia 34.6 0.47 Canada

HLS 33.5 0.42 US

Hungo 27.4 0.65 Angola

Icthys 50.0 0.09 Australia

Iran heavy 30.7 1.80 Iran

Iran Light 33.7 1.50 Iran

Isthmus 33.6 1.30 Mexico

Johan Sverdrup 28.0 0.80 Norway

Jubilee 36.4 0.26 Ghana

Karachaganak 44.7 0.81 Kazakhstan

Kashagan 43.0 0.80 Kazakhstan

Kebco 29.9 1.72 Kazakhstan

Kern River 13.0 1.10 California

Khafji 29.0 2.85 Neutral Zone

Kikeh 36.7 0.06 Malaysia

Kimanis 38.6 0.06 Malaysia

Kirkuk 36.0 2.00 Iraq

Kissanje 30.7 0.36 Angola

Kole 30.2 0.34 Cameroon

Kuito 22.0 0.73 Angola

Kumkol 41.2 0.11 Kazakhstan

Kutubu 45.0 0.04 Papua New Guinea

Kuwait 31.0 2.52 Kuwait

Labuan 29.9 0.03 Malaysia

Lavan Blend 35.2 1.78 Iran

LHS 42.0 0.45 US

Line 63 28.0 1.02 US

Liza 32.0 0.58 Guyana

LLB 20.9 3.46 Canada

LLS 38.5 0.39 US

Loreto 18.1 1.30 Peru

LSB 36.1 1.05 Canada

Maari 37.7 0.08 New Zealand

Magdalena 20.0 1.60 Colombia

Mandji 30.0 1.00 Gabon

Marib 43.3 0.17 Yemen

Marlim 19.2 0.78 Brazil

Mars 28.0 1.93 US

Masila 31.0 0.54 Yemen

Maya 22.0 3.30 Mexico

Medanito 42.5 0.30 Argentina

Mellitah 42.0 0.10 Libya

Merey 16.0 2.45 Venezuela

Mesa 30 30.0 0.90 Venezuela

Midale 30.0 2.35 Canada

Midway Sunset 13.0 1.20 US

Minas 35.0 0.08 Indonesia

Miri light 29.8 0.08 Malaysia

Monagas 18 18.0 3.34 Venezuela

Mondo 29.9 0.42 Angola

Mostarda 28.2 1.83 Angola

MSW 40.5 0.40 Canada

Murban 40.4 0.79 UAE

N'Kossa 41.3 0.18 Congo

Nanhai light 39.5 0.05 China

Napo 19.0 2.01 Ecuador

Nemba 38.7 0.19 Angola

New Zafiro 30.6 0.27 Equatorial Guinea

Nile Blend 32.8 0.05 Sudan

Niobrara 39.0 0.39 US

Norne 32.7 0.21 Norway

NW Shelf 60.0 0.01 Australia

Nowruz-Soroush 18.9 3.44 Iran

Okono 40.7 0.07 Nigeria

Olmeca 39.3 0.80 Mexico

Oman 33.3 1.06 Oman

Oriente 24.0 1.40 Ecuador

Oseberg 39.6 0.20 Norway

Palanca 37.2 0.18 Angola

Panyu 30.0 0.25 China

Pazflor 25.6 0.43 Angola

Peng Lai 21.2 0.30 China

Petrozuata 20.0 2.90 Venezuela

Plutonio 33.2 0.37 Angola

Poseidon 30.5 1.70 US

Pyrenees 19.0 0.21 Australia

Qua Iboe 36.6 0.13 Nigeria

Qatar land 41.1 1.22 Qatar

Qatar marine 36.2 1.60 Qatar

Qatari DFC 55.0 0.74 Qatar

Qatari LSC 59.1 0.10 Qatar

Rabi 33.2 0.14 Gabon

Rajasthan 29.5 0.09 India

Rang Dong 39.6 0.05 Vietnam

Ravva 36.0 0.07 India

Roncador 19.8 0.93 Brazil

Saharan blend 46.0 0.10 Algeria

Sakhalin blend 44.7 0.16 Russia

San Joaquin 26.0 1.10 US

Santa Barbara 36.0 0.95 Venezuela

Sarir 38.0 0.83 Libya

Saxi Batuque 32.6 0.28 Angola

Schiehallion 25.5 0.47 UK

Senipah 51.0 0.03 indonesia

Seria Blend 38.0 0.08 Brunei

Shengli 24.0 0.90 China

Siberian light 34.8 0.57 Russia

Sirri 33.3 1.79 Iran

Sirtica 41.0 0.40 Libya

Sleipner Cond 63.2 0.02 Norway

Sokol 35.6 0.27 Russia

Souedieh 23.1 4.20 Syria

Southern Green Canyon 28.5 2.14 US

Statfjord 39.1 0.22 Norway

Stybarrow 22.8 0.12 Australia

Sutu Den 35.8 0.05 Vietnam

Suez blend 30.4 1.65 Egypt

Syncrude Sweet 33.0 0.16 Canada

Syrian heavy 23.1 4.19 Syria

Syrian light 38.0 0.68 Syria

Tapis 46.0 0.02 Malaysia

Tengiz 47.5 0.47 Kazakhstan

Terra Nova 33.2 0.48 Canada

THUMS 17.0 1.50 US

Thunder Horse 31.5 0.96 US

Tia Juana light 31.9 1.18 Venezuela

Troll 35.9 0.14 Norway

Tui 42.3 0.07 New Zealand

Tupi 29.0 0.88 Brazil

Umm Lulu 41.6 0.68 UAE

Umm Shaif 36.5 1.39 Abu Dhabi

Upper Zakum 34.0 1.95 UAE

Urals 30.6 1.48 Russia

Usan 29.9 0.28 Nigeria

Van Gogh 17.0 0.37 Australia

Vasconia 24.3 0.83 Colombia

Vincent 18.5 0.55 Australia

Vityaz 39.0 0.18 Russia

Volve 29.8 1.72 Neutral Zone

Wafra 24.5 3.88 Neutral Zone

WCS 20.1 3.64 Canada

West Seno 38.0 0.12 Indonesia

White Cliffs 46.0 0.39 US

White Rose 30.6 0.28 Canada

Widuri 33.3 0.07 Indonesia

Wilmington 17.0 1.20 US

WTI 42.0 0.45 US

WTS 38.0 0.50 US

Wyoming Sweet 32.0 0.90 US

Yoho 40.1 0.10 Nigeria

YK blend 33.7 0.76 Russia

Zafiro 29.5 0.26 Equatorial Guinea

Zakum 40.9 1.03 Abu Dhabi

Zarzaitine 42.8 0.06 Algeria

Zuata Sweet 31.0 0.13 Venezuela

Zueitina 41.5 0.31 Libya