Toyota and Nissan Turn to New Oil Blends as Group III Shortage Persists

Toyota Motor North America, the Plano based arm of the world's largest carmaker, is at the center of an industry wide effort to keep engine oil flowing through dealer service networks. On August 16, 2026 the Financial Times reported that the world's largest vehicle manufacturers are turning to newly approved lubricant blends in order to avert a full motor oil crisis, five months after a shortage of Group III base oils began reshaping the lubricant market.

Group III base oil is the highly refined petroleum stock that forms the backbone of modern full synthetic motor oil. Base oil accounts for roughly 75 percent of the content of a finished engine lubricant, so any squeeze on that single ingredient reaches retail prices within weeks. The grades that depend most heavily on Group III are the ultra thin oils such as 0W-8, 0W-16 and 0W-20 that modern hybrid and fuel efficient engines require to meet fuel economy and emissions targets. Thicker grades such as 5W-30 and 10W-40 can carry a larger share of cheaper Group II base oil and have been noticeably less exposed.

The disruption began in late February 2026, when the escalation of the conflict with Iran effectively closed the Strait of Hormuz to commercial shipping. Damage to a major gas to liquids plant in Qatar in March removed a further slice of world capacity. Around 44 percent of the Group III base oil used in the United States had been arriving from a small number of Persian Gulf refineries, and Europe drew more than a third of its supply from the same region. Combined premium base oil exports from Bahrain, Qatar and the United Arab Emirates to Asia, Europe and the United States fell below 50,000 tonnes in May, against more than 185,000 tonnes in March.

Carmakers were among the first industrial buyers to react publicly. Toyota Motor North America issued internal bulletin 2026-013 on April 30, warning parts and service managers of temporary supply problems affecting Toyota Genuine Motor Oil in 0W-8 and 0W-16, and recommending that dealers apply substitution guidelines one day per week for 0W-8 and one day every other week for 0W-16. Nissan followed with a bulletin dated May 1 that capped dealer allocation of its genuine oils at 55 percent of prior year volumes, citing reduced production capacity for most lubricant products. By late May Nissan had extended rationing to 5W-30 and 0W-20 and had set priority rules for which customers get served first.

Prices moved just as quickly. Wholesale Group III passed 10 dollars per gallon in May, a level without recent precedent, and lubricant suppliers pushed through four successive rounds of increases, the fourth of which took effect on May 22 and added up to 3 dollars per gallon on Group III based products. The Independent Lubricant Manufacturers Association warned in its May customer brief that the United States would exhaust its stock of Gulf origin Group III during June and that conditions were unlikely to normalize before mid 2027.

South Korea was expected to act as the safety valve, since it hosts several of the largest dedicated Group III production units in the world and normally supplies about 30 percent of American imports. That relief proved partial. Korean refiners depend on Middle East crude for their own feedstock, and Seoul introduced export caps on refined petroleum products in May to protect domestic supply. Indian and Chinese volumes became more active in export discussions during the summer, but those barrels do not always carry the approvals that carmakers demand for warranty covered service work.

The political picture improved in June. A United States and Iran agreement opened the way to the reopening of the Strait of Hormuz, and crude and freight costs eased over the following weeks. The recovery in finished lubricants has been slower and uneven. An analysis published by industry publication JobbersWorld on July 28 found that Group III transaction prices remained roughly 8 dollars per gallon above pre conflict levels, an increase of more than 230 percent for the widely used 4 cSt grade, and that much of that cost had not yet passed through to finished product prices. More than 30 separate price increase announcements had been tracked since March 11, with cumulative increases approaching 30 percent on synthetics. Physical repairs to the damaged Qatari plant and elevated inventory costs mean the industry expects a staged recovery measured in months rather than days.

That lag explains the strategy the Financial Times described on August 16. Rather than wait for Gulf volumes to return, manufacturers are validating reformulated products that lean more heavily on Group II and on alternative Group III sources, and are broadening the list of approved oils their dealers may use. Reformulation is not a simple swap. Every blend has to be tested against the manufacturer specification attached to a given engine, because the owner's manual grade is a warranty condition and a heavier oil can reduce fuel economy and increase internal drag. Approval work of this kind normally takes many months, which is why the industry response has moved from rationing in the spring toward qualification of new blends during the summer.