---
kind: "section"
citation: "40 C.F.R. § 1065.705"
title: "40"
number: "1065.705"
heading: "Residual and intermediate residual fuel."
url: "https://uscodex.org/cfr/40/1065.705"
---

# §1065.705. Residual and intermediate residual fuel.


This section describes the specifications for fuels meeting the definition of residual fuel in [40 CFR 1090.80](/cfr/40/1090.80.md), including fuels marketed as intermediate fuel. Residual fuels for service accumulation and any testing must meet the following specifications:

- (a) The fuel must be a commercially available fuel that is representative of the fuel that will be used by the engine in actual use.
- (b) The fuel must be free of used lubricating oil. Demonstrate this by showing that the fuel meets at least one of the following specifications.
  - (1) **Zinc is at or below 15 mg per kg of fuel based on the procedures specified in IP—** 470, IP—501, or ISO 8217 (incorporated by reference, see [§ 1065.1010](/cfr/40/1065.1010.md)).
  - (2) **Phosphorus is at or below 15 mg per kg of fuel based on the procedures specified in IP—** 500, IP—501, or ISO 8217 (incorporated by reference, see [§ 1065.1010](/cfr/40/1065.1010.md)).
  - (3) **Calcium is at or below 30 mg per kg of fuel based on the procedures specified in IP—** 470, IP—501, or ISO 8217 (incorporated by reference, see [§ 1065.1010](/cfr/40/1065.1010.md)).
- (c) The fuel must meet the specifications for one of the categories in the following table:

## Notes

### Amendments

[79 FR 23808, Apr. 28, 2014, as amended at 85 FR 78468, Dec. 4, 2020; 86 FR 34569, June 29, 2021; 89 FR 29823, Apr. 22, 2024]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[79 FR 23808, Apr. 28, 2014, as amended at 85 FR 78468, Dec. 4, 2020; 86 FR 34569, June 29, 2021; 89 FR 29823, Apr. 22, 2024]