Crude Oil Grades and Benchmarks: What Lenders Check

Crude oil is not one product. Each grade has its own density, measured as API gravity, and its own sulfur content, and those two properties largely decide what refiners will pay for it. Most grades are priced as a differential to one of three benchmarks: Brent, West Texas Intermediate (WTI) or Dubai/Oman. For trade finance, the grade and the benchmark tell a lender how liquid the cargo is, how its price will move, and how easy it would be to sell if the buyer fails.

API gravity: light versus heavy

API gravity is the American Petroleum Institute measure of the specific gravity of crude oil, expressed in degrees. The U.S. Energy Information Administration gives the formula as degrees API equals 141.5 divided by the specific gravity at 60 degrees Fahrenheit, minus 131.5. The higher the number, the lighter the crude. Light crudes generally yield more high-value products such as gasoline and diesel. Heavy crudes need more complex refineries.

Sulfur: sweet versus sour

Crude with low sulfur is called sweet; crude with high sulfur is called sour. Sour crude needs more processing to meet fuel sulfur limits, so it usually sells at a discount to sweet crude of similar density. A refinery's configuration decides which grades it can run, which also decides which buyers exist for a given cargo.

The three main benchmarks

The EIA describes Brent, WTI and Dubai/Oman as three of the most significant benchmarks in global crude markets:

Other grades are priced against these benchmarks by an agreed differential. The EIA explains that the differential reflects quality, such as API gravity and sulfur, transport costs from the field to refineries, and regional supply and demand, including refinery utilization.

Why grade matters to a lender

Liquidity of the collateral

If a buyer defaults, the lender may need to sell the cargo. A common grade with many refinery buyers is easier to resell than a rare or difficult grade. Lenders often apply larger haircuts to less liquid grades.

Price risk and basis risk

A trader may hedge with Brent futures while the physical cargo is priced at a differential to Brent, or to another benchmark. The hedge covers the benchmark move but not changes in the differential. That gap is basis risk. See basis risk in commodity finance and how lenders assess commodity price risk.

Quality claims

If the cargo arrives off-specification, the buyer may claim a price reduction or reject it. That reduces or delays the repayment source. Independent inspection at loading, and a clear specification in both contracts, is the usual protection.

Assays and why lenders ask for them

A crude assay is a laboratory analysis of a grade's properties and the yield of products it gives when refined. Refiners use assays to decide whether a grade fits their plant and what it is worth to them. Lenders use them more simply: an assay from a recognised laboratory confirms that the grade is what the seller says it is, and helps estimate who else would buy it if the original buyer fails. For a well-known grade, a published assay and a recent quality certificate are usually enough. For a new or rarely traded grade, expect a lender to ask for a recent assay, the refineries that have run it, and how the differential to the benchmark has been set. A grade with no assay and no refinery history is very hard to finance, because the lender cannot judge its resale value.

What should appear in the contract and the file

• The grade name and a full specification: API gravity, sulfur, and any other limits the buyer requires.
• The pricing formula: benchmark, differential, and the pricing period (for example, an average of quotes around the bill of lading date).
• The inspection company and the place of inspection.
• The remedy if quality is outside the specification.
• The hedge plan, showing the benchmark used and how basis risk is handled. See how physical commodity traders hedge price risk.

Grade, origin and compliance

Some grades are closely associated with specific origins. Where an origin is subject to sanctions or price restrictions, lenders will check that the cargo's grade, loading port and documents are consistent with the declared origin. Blending or relabelling to disguise origin is a known evasion method, so mismatches between grade and documents are a red flag. See vessel and sanctions screening in crude oil trade finance.

Volatility in 2026

Benchmark prices have been unusually volatile. The IEA's November 2026 Oil Market Report said North Sea Dated crude fell from a high of $136 a barrel in early October 2026 to $93 at the time of writing, as Gulf exports recovered. Moves of that size change cargo values, margin calls and borrowing base availability within weeks. Lenders will expect hedging and margin arrangements to be in place before they advance.

Putting it together

A lender reads the grade and benchmark as a summary of the trade's risk: how easy the oil is to sell, how well the price can be hedged, and how much can go wrong on quality. A trader who explains all three in the file, rather than leaving the lender to work it out, will usually get a faster answer. For the bigger picture, read crude oil trade finance explained.

Financely helps traders and refiners present grade, pricing and hedge information in a form lenders accept. Financely is an advisor and arranger only. See the oil and gas trade finance advisory.

Frequently Asked Questions

What is API gravity in crude oil?

API gravity is the American Petroleum Institute measure of crude oil density in degrees. Higher numbers mean lighter crude. The EIA gives the formula as 141.5 divided by specific gravity at 60 degrees Fahrenheit, minus 131.5.

What is the difference between sweet and sour crude?

Sweet crude has low sulfur and sour crude has high sulfur. Sour crude needs more processing and usually sells at a discount to sweet crude of similar density.

What are the main crude oil benchmarks?

Brent, West Texas Intermediate and Dubai/Oman. Other grades are priced at a differential to one of them, reflecting quality, transport costs and regional supply and demand.

Why do lenders care about crude grade?

Grade affects how easily the cargo can be resold, how well the price can be hedged, and the risk of quality claims. Less common grades often attract larger haircuts.

Financely is an advisor and arranger. It does not lend, issue instruments or take title to cargo, and no financing outcome is promised. This article is general information, not legal, tax or sanctions advice.