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Story summary
- Costco raised Kirkland Signature full-synthetic motor oil price and set a two-case weekly purchase limit.
- The 10-quart case now costs $57.99, up from roughly $30 in earlier years.
- Each jug bears the Dexos 1 Gen 3 label, a GM specification that requires per-product and per-unit licensing fees.
- Refiners earn about $1 per gallon more from gasoline than from base oil, tightening lubricant supply.
