Base oil sits at the top of the lubricant chain, and SN150 and SN500 are the two highest-volume viscosity grades. Domestic Group II and Group III capacity has climbed fast over the past several years, pulling import dependence down from its earlier peak, though top-end Group III long-chain alkylbenzene still needs imports to fill the gap.

The price anchors to crude. With Brent above $113, the base oil cost line moves up in step, while a stronger RMB (USD/CNY 6.6558) shaves the landed cost of imported material. Between the two, the quote elasticity of imported Group II base oil CFR East China narrows, and domestic refiners enjoy relatively easier margins.

Bonded warehouse receipts play a financing role on this chain. Imported base oil first generates a digital receipt inside the bonded tank; banks lend against that receipt and release title only when the bill of lading, inspection and warehouse entry documents agree. Against a letter of credit's document check, this flow shortens the capital tie-up from issuance to pickup.

On the demand side, industrial lubricants track manufacturing activity while automotive oils rest on the vehicle parcel. Longer drain intervals and channel de-stocking this year keep base oil demand on restocking necessity rather than hoarding. Capacity release at the supply end plus lower import cost make this a buyer's market near term; traders compete on bonded-tank turnover and receipt financing speed, not on betting on a price rally.