Sinclair is committed to protecting the air we all breathe. As part of an initiative from the Environmental Protection Agency (EPA), we’re producing low-sulfur Tier 3 gasoline, a high-quality fuel that significantly reduces emissions. We’ve invested in our refineries long term to produce this fuel, and it will be available across all our stations in the entire Rocky Mountain region.

Frequently Asked Questions

What is Tier 3 gasoline? 

Tier 3 is a set of national standards that requires refineries to reduce the sulfur content in gasoline. The Environmental Protection Agency created this program to help reduce harmful emissions from vehicles by reducing the sulfur content in gasoline – from an annual average of 30 parts per million (PPM) to 10 PPM. These new regulations for all refineries went into law on Jan. 1, 2020.1 The program also includes new standards for motor vehicles to be phased in from model year 2017 through 2025.

Who is producing Tier 3 gasoline?

Some refineries, such as our refinery in Sinclair, Wyoming, are actually producing low-sulfur fuel while others are complying with the regulation by purchasing sulfur credits. In 2020, Sinclair was pleased to announce a commitment to produce these lower sulfur fuels and offer Tier 3 gasoline at all branded stations in the Salt Lake area.

What is the difference between Tier 3 and TOP TIER™ gasoline?

TOP TIER™ gasoline follows standards set by auto manufacturers. It has a detergent additive that helps clean the engine, injectors and valves during use. Learn more.

Tier 3 Gasoline follows standards set by the EPA. It has had sulfur removed from the fuel to reach an average low of 10 PPM over the course of a year – ultimately reducing emissions.

What are the benefits of Tier 3 gasoline?

Tier 3 gasoline could reduce harmful emissions by up to 80% in vehicles that are model year 2017 and newer.2 For older cars, it could reduce harmful emissions up to 14%.2 This includes lowering harmful exhaust emissions of NOx gases and other ozone-forming emissions – ultimately improving the quality of the air we breathe, both in the winter and summer months.

Learn more at

  1. Tier 3 standards took effect on Jan. 1, 2017. Smaller refineries could delay compliance
    until Jan. 1, 2020.
  2. As defined by the EPA.