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CAN CGSB 3.5-2016 amd1-2017: Automotive Gasoline Specification for Canada
Updated Fuel Quality Requirements for Lower Emissions and Enhanced Performance
CAN CGSB 3.5-2016 amd1-2017 is the national standard of Canada governing the quality and performance of unleaded automotive gasoline for spark-ignition engines. Published by the Canadian General Standards Board (CGSB), this standard encompasses regular, mid-grade, and premium fuel grades, specifying parameters such as octane rating, volatility, composition, and contaminant limits. Amendment 1:2017 introduced key updates aligned with federal environmental regulations, particularly reducing allowable sulfur and benzene content to meet the Canadian Environmental Protection Act (CEPA) targets.
Scope and Applicability
This standard applies to unleaded automotive gasoline intended for use in on-road vehicles with spark-ignition engines. It covers fuel blends containing ethanol up to 10 % by volume (E10) and includes oxygenates such as ethanol, methyl tert-butyl ether (MTBE) where permitted. The standard excludes aviation gasoline, racing fuel, and fuels for non-road engines (e.g., marine, off-road). Grades are defined by Anti-Knock Index (AKI) – regular (87), mid-grade (89), and premium (91 or higher). Amendment 1:2017 ensures alignment with the Sulphur in Gasoline Regulations (SOR/2017-111) and updates the benzene limit as part of Canada’s Environmental Contaminants Act.
Technical Requirements and Specification Limits
CAN CGSB 3.5-2016 amd1-2017 establishes mandatory limits for both performance and composition. The primary requirements are summarized below.
General Property Limits (All Grades)
| Property | Limit (after amd1:2017) | Test Method |
|---|---|---|
| Sulfur | ≤ 30 mg/kg | ASTM D5453 |
| Benzene | ≤ 0.8 % v/v | ASTM D3606 |
| Aromatics | ≤ 35 % v/v | ASTM D1319 |
| Olefins | ≤ 10 % v/v | ASTM D1319 |
| Lead | < 5 mg/L | ASTM D3237 |
| Oxygen (mass) | ≤ 3.7 % | ASTM D4815 |
| RVP (Class B, summer) | 48 – 72 kPa | ASTM D5191 |
| Copper strip corrosion | No. 1 max | ASTM D130 |
| Oxidation stability | ≥ 240 min | ASTM D525 |
| Washed gum content | ≤ 5 mg/100 mL | ASTM D381 |
Octane Requirements and Grade Distinction
| Grade | AKI (R+M)/2 | Typical RON | Typical MON |
|---|---|---|---|
| Regular | 87 | 91 | 82 |
| Mid-Grade | 89 | 93 | 84 |
| Premium | 91 & higher | 95+ | 85+ |
Distillation requirements (10 % evaporation point, 50 % point, 90 % point) and final boiling point are specified per class to ensure proper vaporization and combustion characteristics. These limits vary by volatility class and season.
Tip: Because RVP classes range from A (high volatility) to D (low volatility), always confirm the applicable class for your region and month to avoid evaporative emission violations. The amendment did not change the RVP tables but reinforced the need to comply with federal volatility regulations.
Implementation Highlights and Best Practices
Producers, importers, and fuel distributors must incorporate the updated limits into their quality assurance programs. Key implementation aspects include:
- Ethanol blending: Ethanol used must be denatured and comply with CGSB 3.511. Blending should account for the lower energy density and potential material compatibility issues in older vehicles.
- Low-sulfur operation: Refineries must reduce sulfur at the process level to meet the 30 mg/kg cap. Supporting infrastructure (storage, pumps) may need cleaning to avoid recontamination.
- Benzene reduction: Refinery feedstock and reforming operations must be adjusted to keep benzene below 0.8 % v/v. Some facilities may require dedicated benzene removal units.
- Testing frequency: The standard expects routine verification at production and import points. Records of test results must be kept for a minimum of three years.
- Product segregation: When shipping gasoline that meets different sulfur limits, labeling and documentation must clearly indicate compliance with CGSB 3.5 amd1.
Important: Amendment 1:2017 included phase-in dates. Sulfur limits became effective June 1, 2017 for production and December 1, 2017 for retail sale. Existing inventories were allowed to be sold after those dates, but new production must meet the tighter cap immediately. Ensure your supply chain documents lot-specific compliance dates.
Compliance and Enforcement Notes
In Canada, compliance with CAN CGSB 3.5-2016 amd1-2017 is mandatory for all gasoline sold for on-road use. Oversight is shared among:
- Environment and Climate Change Canada (ECCC) – enforces sulfur, benzene, and oxygen content limits under CEPA.
- Measurement Canada – ensures accurate quantity and octane labeling at retail.
- Canadian General Standards Board – administers the standard and accredits testing laboratories.
Non-compliance can lead to product recalls, administrative monetary penalties, and legal action. The standard is also referenced by the Canadian Armed Forces for ground equipment, making it a critical document for military fuel procurement as well.
Warning: Supplying gasoline that exceeds the sulfur or benzene limits is a violation of the Canadian Environmental Protection Act, 1999. Fines can be substantial, and repeated non-compliance may lead to court-ordered remediation or shutdown. Always maintain a robust quality management system.
For organizations exporting gasoline to the United States, note that ASTM D4814-22 is the equivalent specification. While many parameters align, differences in volatility classes and test methods (e.g., RVP at 100 °F vs. 37.8 °C) require careful cross‑referencing to avoid costly re‑blending at the border.
Frequently Asked Questions
Q: What is the main change introduced by amendment 1:2017?
A: The biggest change is the reduction of the maximum sulfur content from 150 mg/kg to 30 mg/kg and benzene from 1.5 % v/v to 0.8 % v/v. The amendment also clarified test methods and updated references to federal regulations.
A: The biggest change is the reduction of the maximum sulfur content from 150 mg/kg to 30 mg/kg and benzene from 1.5 % v/v to 0.8 % v/v. The amendment also clarified test methods and updated references to federal regulations.
Q: Does this standard allow ethanol blends higher than 10 %?
A: No. CAN CGSB 3.5-2016 amd1-2017 covers blends up to 10 % ethanol by volume. Higher ethanol blends (e.g., E15, E85) are governed by separate CGSB standards (3.511 for denatured ethanol, 3.516 for E85).
A: No. CAN CGSB 3.5-2016 amd1-2017 covers blends up to 10 % ethanol by volume. Higher ethanol blends (e.g., E15, E85) are governed by separate CGSB standards (3.511 for denatured ethanol, 3.516 for E85).
Q: How is the octane rating defined in this standard?
A: Octane is expressed as the Anti-Knock Index (AKI), calculated as the average of Research Octane Number (RON) and Motor Octane Number (MON): (RON+MON)/2. Minimum AKI values are 87 (Regular), 89 (Mid-Grade), and 91 (Premium).
A: Octane is expressed as the Anti-Knock Index (AKI), calculated as the average of Research Octane Number (RON) and Motor Octane Number (MON): (RON+MON)/2. Minimum AKI values are 87 (Regular), 89 (Mid-Grade), and 91 (Premium).
Q: Are there different volatility requirements for different regions?
A: Yes. The standard defines four volatility classes (A through D) based on geographic location and seasonal temperature. For example, higher volatility (Class A) is allowed in winter for better starting, while lower volatility (Class D) is required in summer to control emissions. Each province may also impose additional RVP restrictions.
A: Yes. The standard defines four volatility classes (A through D) based on geographic location and seasonal temperature. For example, higher volatility (Class A) is allowed in winter for better starting, while lower volatility (Class D) is required in summer to control emissions. Each province may also impose additional RVP restrictions.
Last reviewed: 2026