US Motor Oil Shortage Deepens in June 2026 as Group III Base Oil Reserves Run Dry
The United States entered June 2026 with its supply of Middle Eastern Group III base oil effectively exhausted, turning weeks of warnings into a real squeeze on the motor oil that millions of drivers depend on. The trouble began in late February 2026, when the conflict involving Iran led to the closure of the Strait of Hormuz, the maritime chokepoint that carries a large share of the crude and refined products feeding the global lubricant chain. A military strike in March then knocked Qatar's Pearl GTL plant offline. That facility is the largest gas-to-liquids site in the world and a major source of the high-quality base oil used in modern synthetic motor oil, so its loss removed a big block of capacity from a market that had little spare room to begin with.
Group III base oil is the part of the story most drivers never think about. It makes up roughly 75 percent of a typical jug of full synthetic oil, and about 44 percent of the US supply has long come from a handful of Persian Gulf refineries. With Gulf shipments blocked and Qatar's plant down, the Independent Lubricant Manufacturers Association warned through May that Gulf-origin Group III stock would be gone by June. That projection has now arrived. The usual backup, South Korean refiners, cannot fill the hole because they also rely on crude routed through the Strait of Hormuz, and the refineries capable of making base oil are instead steering output toward diesel and jet fuel, where margins sit near multi-decade highs.
The grades hit hardest are the thin, low-viscosity oils that newer engines require: 0W-8, 0W-16, and 0W-20. The 0W-20 grade alone covers millions of vehicles built since roughly 2012. Heavier grades such as 5W-30 and 10W-30 are less exposed because they can be blended with a larger share of Group II base oil, which is not under the same strain. This is why the shortage is grade-specific rather than a blanket disappearance of oil from every shelf.
The supply chain showed clear stress through May. Costa Kapothanasis, who runs the Costa Oil chain of oil-change shops, reported on May 12 that Mobil and Shell had told Costco and Walmart they had no packaged product left to ship and to expect bare shelves within weeks. Toyota issued a service bulletin advising dealers to partially substitute affected grades, naming ExxonMobil as the strained supplier of its 0W-8 and 0W-16 oils. Nissan prepared a similar notice, confirmed as authentic, flagging reduced lubricant allocations and higher oil-change prices. A leaked AutoZone memo to Southeast store managers warned that availability of motor oil and related fluids could fall by as much as 40 percent and that costs would rise sharply.
By early June the picture is mixed but worsening. Shoppers have reported Kirkland 0W-20 and 5W-30 missing from Costco shelves, with employees confirming no fresh private-label stock is on the way, and Walmart is running low on nearly every grade it carries though it has held prices steady so far. Wholesale Group III prices have climbed past 10 dollars per gallon, an historically high level, and some products have jumped up to 30 percent in a matter of weeks. Industry analysts stop short of calling it a broad retail shortage, describing instead a market operating defensively where availability now matters as much as price. The American Petroleum Institute has granted emergency provisional licensing so blenders can shift formulations toward alternative base oils without losing their quality certifications.
The outlook is not encouraging. The ILMA (Independent Lubricant Manufacturers Association) expects base oil conditions to stay abnormal until at least the middle of 2027, with the market undersupplied through that period. Recovery depends largely on whether the Strait of Hormuz reopens and Gulf refineries restart, and the heavy damage to the Pearl GTL plant means even an optimistic scenario points to many months of disruption.
For drivers, the practical advice is steady.
Do not delay routine oil changes, since a worn engine is far more expensive than a slightly pricier service. Stick to the viscosity printed on your oil cap or in your owner's manual rather than grabbing whatever is on the shelf.
It is fine to switch brands as long as the replacement carries the same API certification and any manufacturer approval your car needs. Only move to a different viscosity when the automaker has explicitly authorized it, and watch for signs of the wrong oil such as a burnt smell, leaks, or noticeably worse fuel economy.
Owners of older vehicles built before about 2015 may find that a quality conventional or semi-synthetic oil is both cheaper and easier to find. If your usual oil appears at a normal price, buying a jug or two for the next change is a reasonable hedge, but stockpiling beyond that only feeds the panic.