Why The Conflict In Iran Is Changing How Engine Oil Is Made And Causing Oil Brands To Get Upset With GM

Key Takeaways

• Iran‑U.S. tensions cut ~44% of U.S. Group III base‑oil supply
• API grants 90‑day emergency licenses to use lower‑grade base oils
• GM’s Dexos program refuses enforcement relief, demanding full re‑approval
• Suppliers face force‑majeure claims, price spikes, and limited inventory
• New North American Group III capacity won’t arrive until 2027

Pulse Analysis

The ongoing Iran‑U.S. standoff has exposed a critical vulnerability in the North American lubricant market: nearly half of the Group III base oil used in synthetic blends originates from the Persian Gulf. Disruptions at facilities in Bahrain, the UAE and Qatar—especially the loss of a 30,000‑barrel‑per‑day Shell plant—have forced the Independent Lubricant Manufacturers Association to warn of supply shortfalls lasting into next year. With South Korean refiners also dependent on Gulf crude, the ripple effect tightens the global feedstock pool, prompting manufacturers to brace for higher input costs and inventory constraints.

In response, the American Petroleum Institute activated its Emergency Provisional Licensing (EPL) program, a temporary measure that lets blenders replace scarce Group III oils with lower‑grade Group II alternatives while preserving the API logo on product labels. The EPL grants up to 90 days of flexibility, provided technical data demonstrate that performance standards remain intact. This stop‑gap helps keep shelves stocked and mitigates immediate price spikes, but it is not a long‑term fix; domestic Group III capacity from Chevron and ExxonMobil won’t be online until 2027, leaving the market reliant on emergency approvals and force‑majeure clauses.

General Motors’ Dexos licensing adds a layer of complexity. Unlike the API’s broad relief, GM insists on full re‑evaluation of any reformulated oil before granting its proprietary approval, rejecting any temporary enforcement pause. The automaker’s stance aims to safeguard engine performance but forces suppliers into costly, time‑intensive testing cycles amid dwindling inventories. This tension highlights a broader industry dilemma: balancing stringent OEM specifications with the need for agile supply‑chain responses in a geopolitically volatile environment. As the conflict persists, manufacturers may increasingly explore alternative base‑oil chemistries or accelerate domestic capacity projects to reduce dependence on Gulf imports.