Why Iran’s Oil Is Among the World’s Most Wanted Crude

Despite decades of sanctions led by the United States, oil from Iran continues to attract strong global demand. Producing roughly 3.5 million barrels of oil per day, Iran remains a significant supplier in the global energy market, with buyers—especially in China—continuing to purchase its crude despite geopolitical pressure.

Two Key Grades: Iran Light and Iran Heavy

Iran’s crude exports mainly consist of two primary grades: Iran Light and Iran Heavy, each suited for different types of refinery systems.

• Iran Light:
  This grade has an API gravity of about 33–36 degrees and a sulphur content of around 1.46%. Because it is lighter crude, it yields higher amounts of refined fuels such as gasoline, diesel and jet fuel, making it attractive to refineries seeking higher fuel output.
• Iran Heavy:
  This type is denser and contains more sulphur, making it suitable for sour crude processing refineries. Many refineries across Asia are specifically designed to process such heavier grades.

API gravity measures how heavy or light crude oil is compared to water. Higher API gravity indicates lighter crude, which generally requires less refining effort and can produce more high-value fuels.

Ultra-Light Condensate From South Pars

Another important export from Iran is condensate from the South Pars Gas Field, one of the world’s largest natural gas fields.

This condensate is ultra-light and nearly sulphur-free, making it useful as a diluent—a substance used to thin heavier crude oil so it can be transported and exported more easily. Since 2020, Iran has shipped this condensate to Venezuela to help process its heavy crude oil.

Discounted Pricing Drives Demand

One of the biggest attractions of Iranian oil is its competitive pricing. Iranian crude often sells at a discount of $3 to $9 per barrel below the global Brent benchmark.

With extraction costs estimated at around $10 per barrel, the discounted price still allows Iran to earn revenue while offering buyers a substantial margin.

China: The Biggest Buyer

China has emerged as the largest importer of Iranian crude. In 2024 alone, China purchased about $32.5 billion worth of Iranian oil, accounting for more than 90% of Iran’s export revenues from crude.

Much of this demand comes from independent refineries in Shandong province, commonly known as “teapot refineries.” These facilities are designed specifically to process medium-heavy and sour crude oil, making Iranian grades ideal for their operations.

The Shadow Fleet and Sanctions Evasion

To bypass sanctions, Iran’s oil trade has developed a complex logistics system often referred to as the “shadow fleet.” This network involves:

• Ship-to-ship oil transfers in waters near Indonesia and Singapore
• Tankers registered under multiple flags
• Cargo relabelling while ships are at sea

These methods make enforcement of sanctions difficult and allow oil shipments to continue reaching buyers.

Technology Makes Heavy Oil More Valuable

Advances in modern refining technology have also increased demand for heavier crude oils. Deep-conversion refineries can efficiently process high-sulphur and heavy crude, turning it into valuable fuels.

This technological shift has transformed Iran’s historically less-valued heavy crude into a sought-after commodity for advanced refineries across Asia.

A Unique Combination in the Global Oil Market

Analysts say Iran’s oil remains highly desirable because it offers three advantages at once:

1. A wide range of crude grades—from ultra-light condensate to heavy sour crude
2. Significant price discounts compared with global benchmarks
3. A logistics network capable of bypassing sanctions

Because of this combination, experts say it would be difficult for other producers—even giants like Saudi Aramco—to fully replicate Iran’s position in the global oil market.