(a) Distillate diesel fuels for testing must be clean and bright, with pour and cloud points adequate for proper engine operation.
(b) There are three grades of #2 diesel fuel specified for use as a test fuel. See the standard-setting part to determine which grade to use. If the standard-setting part does not specify which grade to use, use good engineering judgment to select the grade that represents the fuel on which the engines will operate in use. The three grades are specified in Table 1 of this section.
Table 1 of § 1065.703 - Test Fuel Specifications for Distillate Diesel Fuel
| Property | Unit | Ultra low sulfur |
Low sulfur |
High sulfur |
Reference procedure a |
|---|---|---|---|---|---|
| Cetane Number | 40-50 | 40-50 | 40-50 | ASTM D613. | |
| Distillation range: | |||||
| Initial boiling point | °C | 171-204 | 171-204 | 171-204 | ASTM D86. |
| 10 pct. point | 204-238 | 204-238 | 204-238 | ||
| 50 pct. point | 243-282 | 243-282 | 243-282 | ||
| 90 pct. point | 293-332 | 293-332 | 293-332 | ||
| Endpoint | 321-366 | 321-366 | 321-366 | ||
| Gravity | °API | 32-37 | 32-37 | 32-37 | ASTM D4052. |
| Total sulfur | mg/kg | 7-15 | 300-500 | 800-2500 | ASTM D2622, ASTM D5453, or ASTM D7039. |
| Aromatics, min. (Remainder shall be paraffins, naphthenes, and olefins) | g/kg | 100 | 100 | 100 | ASTM D5186. |
| Flashpoint, min. | °C | 54 | 54 | 54 | ASTM D93. |
| Kinematic Viscosity | mm2/s | 2.0-3.2 | 2.0-3.2 | 2.0-3.2 | ASTM D445. |
(c) You may use the following nonmetallic additives with distillate diesel fuels:
(1) Cetane improver.
(2) Metal deactivator.
(3) Antioxidant, dehazer.
(4) Rust inhibitor.
(5) Pour depressant.
(6) Dye.
(7) Dispersant.
(8) Biocide.
[70 FR 40516, July 13, 2005, as amended at 73 FR 37340, June 30, 2008; 73 FR 59341, Oct. 8, 2008; 75 FR 23057, Apr. 30, 2010; 77 FR 2464, Jan. 18, 2012;79 FR 23807, Apr. 28, 2014; 85 FR 78468, Dec. 4, 2020; 86 FR 34569, June 29, 2021]