Sharing this since we’ve been discussing this very thing. Costco starts rationing motor oil as a key ingredient shortage, driven by the Iran war, pushes prices sharply higher. The retailer hiked its Kirkland Signature full synthetic oil from the mid-$30s to $57.99 and now caps purchases at two units per membership every seven days, with Mobil 1 also capped at five units. Industry group ILMA’s CEO Holly Alfano said the real culprit is a shortage of Group III base oil, whose price has jumped 235 percent since the Middle East war began, since roughly 40 percent of US supply comes from Middle Eastern facilities damaged in the fighting and another 30 percent from South Korea, which relies on Middle Eastern crude. The closure of the Strait of Hormuz has compounded the problem by raising shipping costs and lengthening delivery times, and oil companies are also prioritizing crude for gasoline, diesel, and jet fuel over motor oil ingredients since those are more profitable right now. Costco’s competitors, including Walmart, AutoZone, and Amazon, haven’t introduced similar limits yet, but Alfano said she doesn’t expect the market to normalize until at least the end of next year, since new Group III production capacity in the US and rebuilt Middle East facilities won’t be ready before then.