COST · News · 20260915N

Inflation and Fuel Price Impact

COSTCO WHOLESALE CORP /NEW · 2026-09-15 · Importance 42 · Surprise 64

The ongoing Iran war has driven crude oil costs higher, contributing to record national average gasoline and diesel prices. Costco nearly doubled the price of its Kirkland Signature full-synthetic motor oil two-pack to $57.99 and imposed membership-based purchase limits on Kirkland and Mobil 1 products. The developments indicate potential broader inflationary pressure across Costco’s merchandise assortment if elevated energy costs persist.

Key facts

• Analysts noted supply pressures affecting motor oil and rising energy costs could lead Costco to increase prices on other products if energy costs continue to climb. source
• National average gas and diesel prices set records, a development mentioned alongside Costco's motor oil price increases. source
• Costco increased motor oil prices and limited purchases due to rising crude oil costs linked to the ongoing Iran war. source