PSC K091

Overview

The Product Service Code (PSC) system is a four-character taxonomy used across U.S. federal procurement to classify what the government buys for reporting, analysis, and category management. PSC entries appear in FPDS/SAM contract records and are maintained through the Product and Service Codes Manual on Acquisition.gov to promote consistent government-wide reporting and spend analytics. ¹

PSC K091 is listed in the PSC Manual under Category K (Modification of Equipment) and is titled “Modification of Equipment- Fuels, Lubricants, Oils, and Waxes.” The code identifies contract actions where the predominant work involves modification, adaptation, or alteration activities specifically related to fuels, lubricants, oils, and waxes as described in the PSC Manual. ¹

• See also on G2X:
  • G2X — PSC K091 overview
  • G2X — PSC K089 overview
  • G2X — PSC J091 overview

What this PSC covers

• Modification and adaptation of fuel formulations and blends to meet performance or specification changes.
• Alteration or reconditioning of lubricants and oils for specific equipment applications.
• Processing or treatment services to change physical or chemical properties of waxes for operational use.
• Installation or retrofit of dispensing, metering, or storage equipment tied to fuels and lubricants.
• Testing, certification, or validation activities performed as part of modification work on these products. ¹

Related NAICS and PSC codes

Official sources do not publish a single prescriptive NAICS crosswalk for PSC K091; NAICS selection should follow the requirement’s predominant industrial activity and NAICS guidance. Not specified by official sources. ¹

Reporting & coding guidance

• Choose PSC K091 for the contract line item when the predominant deliverable (by dollar value) is modification work on fuels, lubricants, oils, or waxes; otherwise select the PSC that best represents the predominant product or service. FPDS guidance requires the PSC reflect the primary product/service procured. ²
• Use the PSC at the contract line item level and document rationale in procurement files when the requirement mixes multiple product/service types. ²

Category context

Category K covers “Modification of Equipment” across multiple material groups; PSC K091 sits beside other K-series PSCs for modification activities and aligns with FPDS reporting practices used by agencies for spend analysis and category management. ¹

Agencies may consult the PSC Manual for authoritative definitions and may use supplemental mapping tools such as PSCTool for portfolio or agency-specific mappings. ³

Frequently asked questions

• What exactly is PSC K091?
  PSC K091 is the Product Service Code for “Modification of Equipment- Fuels, Lubricants, Oils, and Waxes,” used to identify procurements where modification of these materials or associated equipment is the primary activity reported in FPDS. ¹

• How should the PSC be chosen for a mixed-scope contract that includes fuels modification plus equipment purchase?
  Select the PSC that represents the predominant product or service by dollar value for the contract line item; if modification of fuels or lubricants is the primary spend, use PSC K091. FPDS rules require the predominant activity to determine PSC selection. ²

• Is there a mandatory NAICS code that pairs with K091?
  The PSC Manual and FPDS do not assign a single mandatory NAICS to PSC K091; NAICS selection depends on the nature of the industrial activity and should follow NAICS guidance in SAM/FPDS. Not specified by official sources. ¹

• Where to find authoritative guidance for PSC selection and reporting?
  See the Product and Service Codes Manual on Acquisition.gov for PSC definitions and FPDS documentation for reporting rules. Agency PSC selection tools (for example PSCTool) provide supplemental mapping and portfolio views. ¹

Useful resources

• G2X — PSC K091 (unnumbered): https://app.g2xchange.com/psc/K091
• Product and Service Codes (PSC) Manual — Acquisition.gov: https://www.acquisition.gov/psc-manual
• FPDS glossary and reporting guidance — FPDS.gov: https://www.fpds.gov/help_V1_1/Glossary.htm
• PSCTool — agency PSC mapping and tools: https://psctool.us/

References

1. Acquisition.gov — Product and Service Codes (PSC) Manual. https://www.acquisition.gov/psc-manual
2. FPDS.gov — Glossary / FPDS documentation (Product or Service Code definition and reporting guidance). https://www.fpds.gov/help_V1_1/Glossary.htm
3. PSCTool — Product/Service Code mapping tools and resources. https://psctool.us/