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PLEASE NOTE THAT THIS FAQ IS OUT OF DATE. Work is being done to move this to a wiki format with updated information, but please check out the TDIClub forums (http://forums.tdiclub.com) in the mean time for more updated information.

The ASTM pour point temperatures for winter diesel

Hello TDI Fans,

Here is a table of the ASTM pour point temperatures for winter diesel. The numbers are taken from the ASTM map of the USA for "Tenth Percentile Minimum Ambient Temperatures For The United States (except Hawaii)". I still can't find the Canadian National Standards Board maps for Canada.

All temperatures are in Celsius. Some states have more than one pour point. The divisions are on a longitude or latitude line and is marked by degrees. If the division is longitude, the degrees will be marked east and west. If the division is latitude, the degrees will be marked north and south. Except California, it is divided into four sections that do not follow any geographical lines (they just got to be different out there). California's divisions are called, North Coast, South Coast, Interior, and Southeast. The coast sections and the interior are divided by the Sierra Nevada Mountains. The coast sections split around Pismo Beach. To define Southeast, find Indio on I-10. Now imagine a straight line north through Indio from Mexico to Nevada. Alaska is divided into three sections at latitudes 72, 62, and 56 degrees.

The diesel fuel in your state is suppose to be blended to the temperatures listed. If your January temperatures do not drop much below -5C, then there is slim chance blended diesel is sold in your state. If a cold front moves in that will bring temperatures close to the pour points or exceeds them, then there is risk for fuel jelling. Most fuel retailers sell diesel fuel that will at least meet the listed pour points. Because of the way diesel fuel jells, a new system for rating winter diesel is being developed. The pour points are not realistic because the test does not take into account that fuel has to pass through a fuel filter. Diesel fuel can have a very high level of jelling and still pass the pour point test. A test called 'Cold Flow Plugging Point' or CFPP measures the fuel's ability to flow through a fuel filter. Cold flow performance to pass the CFPP test will be 2C degrees maximum above the ASTM D-975 tenth percentile numbers. These numbers should be incorporated into existing standards by late 1998. Winterized fuel meeting CFPP numbers should be on the market for late 1998.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

AL

4

-3

-6

-7

-3

-2

AK

72S

-25

-37

-45

-49

-47

-43

AK

62S

-11

-13

-18

-32

-32

-29

AK

56S

-4

-11

-16

-19

-13

-12

AZ

34N

-4

-12

-14

-17

-16

-12

AZ

34S

7

0

-2

-4

-3

-1

AR

2

-4

-7

-11

-7

-3

CA

(SC)

6

-6

1

-1

0

2

CA

(NC)

4

0

-2

-2

-1

-1

CA

(IN)

2

-3

-4

-7

-6

-6

CA

(SE)

1

1

8

-11

-7

-5

CO

105W

-8

-18

-25

-30

-24

-16

CO

105E

-2

-12

-14

-19

-15

-12

CT

-1

-7

-16

-17

-16

-9

DE

2

-3

-10

-11

-10

-6

FL

29N

7

1

-1

-3

-1

-4

FL

29S

14

7

3

3

5

7

GA

3

-2

-6

-7

-6

-2

HI

ID

-4

-13

-18

-21

-18

-13

IL

40N

-1

-9

-19

-21

-13

-11

IL

1

-7

-16

-17

-15

-8

IN

-1

-7

-16

-18

-16

-9

IA

-2

-13

-23

-28

-22

-16

KS

-2

-11

-15

-19

-14

-13

KY

1

-6

-13

-14

-11

-6

LA

5

-1

-3

-4

-2

1

ME

-3

-10

-23

-26

-26

-18

MD

2

-3

-10

-12

-10

-4

MA

-2

-7

-16

-18

-17

-10

MI

2

-11

-20

-23

-23

-18

MN

-4

-18

-30

-34

-31

-24

MS

3

-3

-6

-6

-4

-1

MO

1

-7

-14

-16

-13

-8

MT

-7

-18

-24

-30

-24

-21

NE

-3

-13

-18

-22

-19

-13

NV

38N

-7

-14

-18

-22

-18

-13

NV

38S

8

0

-3

-4

-2

1

NH

-3

-8

-18

-21

-21

-12

NJ

2

-3

-11

-12

-11

-6

NM

34N

-2

-11

-14

-17

-14

-11

NM

34S

4

-4

-8

-17

-7

-3

NY

42N

-3

-8

-21

-24

-24

-16

NY

42S

-1

-5

-14

-16

-15

-9

NC

-1

-7

-10

-11

-9

-5

ND

-4

-20

-27

-31

-29

-22

OH

-1

-7

-16

-17

-15

-9

OK

1

-8

-12

-13

-8

-7

OR

122W

0

-4

-5

-7

-4

-3

OR

122E

6

-11

-14

-19

-21

-9

PA

41N

-3

-8

-19

-20

-21

-15

PA

41S

1

-6

-13

-14

-14

-8

RI

1

-3

-12

-13

-13

-9

SC

5

-1

-5

-5

-3

-2

SD

-4

-14

-18

-27

-24

-18

TN

1

-5

-9

-11

-9

-4

TX

31N

3

-6

-9

-13

-9

-7

TX

31S

9

2

-1

-3

-1

2

UT

-2

-11

-14

-18

-14

-8

VT

-3

-8

-20

-23

-24

-15

VA

2

-3

-9

-11

-9

-4

WA

122W

0

-3

-3

-7

-4

-3

WA

122E

-2

-8

-11

-18

-11

-8

WV

-3

-8

-15

-16

-14

-4

WI

-4

-14

-24

-28

-24

-18

WY

-4

-15

-18

-26

-19

-16

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