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The San Joaquin Refinery is a very small, medium-complexity, specialty products (non-transportation-fuels-focused) refiner, processing only San Joaquin Valley heavy naphthenic crude oil ( Kern County — California’s largest oil-producing county).

Configuration / Capacities

 CEC lists 15,000 b/cd atmospheric crude distillation capacity (source: EIA Refinery Capacity Reports); company declares 24,300 BPD. The CEC/EIA figure reflects operable atmospheric crude capacity reporting; the company figure likely represents nameplate or design capacity.

Product Slate

Naphthenic specialty oils (branded series):

• RAFFENE^® — rubber process oil, ink oil, adhesives, lubricating base oil, de-dust oil, tire industry applications, resin solutions
• HYNAP^® — naphthenic lubricating base oils, insecticides, explosives, paints & coatings, pigments, hydraulic fluids, industrial lubricants, metalworking fluids, pump oil, process oil
• HYTRANS^® — insulating oil for transformers and switchgear
• NAPSOL^® — drilling fluid, fracking fluid, ink solvent
• RAFFEX^® — high-aromatic, low-aniline-point, free of asphaltenes; rubber, resins, recycling agents, road oils

Non-lube products:

• ULS No.2 Diesel (CARB compliant, <15 ppm S, wax-free, −75°F pour point; off-road red dye available)
• Conventional Asphalt (Caltrans Certificate of Compliance approved supplier)
• Polymer Modified Asphalt (SBS-modified, “very stable”)
• Asphalt Cutback (SC-800, SC-3000)
• Roofing Applications products

References

1. San Joaquin Refining Co. Inc. — Home (accessed: Aug 29, 2026)
2. San Joaquin Refining Co. Inc. — About Us (accessed: Aug 29, 2026)
3. San Joaquin Refining Co. Inc. — Capabilities (accessed: Aug 29, 2026)
4. San Joaquin Refining Co. Inc. — Products (accessed: Aug 29, 2026)
5. California Energy Commission — California Oil Refinery History (current as of Jan 26, 2026)
6. California Air Resources Board — California Refineries (updated: May 5, 2026)
7. Lubes’n’Greases — Naphthenic base oil producer San Joaquin Refining will be installing a new vacuum distillation tower at its refinery in Bakersfield, California… (Jan 9, 2023)
8. Polymerupdate — San Joaquin Refining to start maintenance at base oil refinery (Nov 9, 2023)
9. Downstream Download — Bakersfield (San Joaquin) refinery (accessed: Aug 29, 2026)
10. Better Business Bureau — San Joaquin Refining Co Business Profile (accessed: Aug 29, 2026)
11. BizProfile — San Joaquin Refining Co., Inc. Bakersfield, CA — filing information (accessed: Aug 29, 2026)
12. Ethanol Producer Magazine — EPA grants full/partial approvals for 14 additional SRE petitions, denies 2 (Jul 2024)
13. US EPA (archived) — Public Notice: Proposed UIC Class I Permit for San Joaquin Refinery Company Inc. (SJR), Bakersfield, CA (accessed: Aug 29, 2026)