Segregation preserves recovery options
Keeping used lubricating oil separate from solvents, coolant and incompatible wastes protects feedstock value and reduces downstream risk.
Reference noteKNOWLEDGE CENTRE 02
Circular Economy & RRBO Centre
Follow used lubricating oil from collection and segregation through re-refining, RRBO qualification and finished-lubricant performance.
12Articles
3Knowledge notes
5Database records
3Latest updates
31 Jul 2026Last verified
LATEST VERIFIED UPDATES
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Curated from primary sources and checked on 31 July 2026.
FULL KNOWLEDGEBASE
Search, learn and verify.
Browse original articles, concise knowledge notes, structured reference records and manually verified official updates.
23 resourcesLatest updates are manually verified, not a live news feed.
Used-oil quality begins at collection, not at the re-refinery
Segregation, storage and chain of custody determine whether a used-oil stream can become dependable re-refining feedstock.
Read article →RRBO is not a finished-lubricant specification
Re-refined base oil can be a valuable formulation input, but origin alone does not establish the performance of the finished product.
Read article →Designing a ULO collection system that protects feedstock value
A practical architecture for linking generation points, authorised collection, segregated storage, transport and verified treatment without treating collection volume alone as proof of circularity.
Read article →From generator to guard tank: chain of custody for ULO
A control framework connecting every physical load, sample, tank movement and processing record while explaining why mass balance alone cannot prove material identity.
Read article →Contamination triage for ULO: water, fuel, glycol, solvents and metals
A staged screening framework for safe unloading and feedstock routing that explains both the value and limitations of common laboratory tests.
Read article →Feedstock sampling and acceptance specifications for re-refining
How to build a defensible incoming-feed specification covering representative sampling, analytical methods, decision rules, quarantine and supplier performance.
Read article →What re-refining processes actually remove
Re-refining is a treatment train, not a single purification step. Pretreatment, distillation, extraction, adsorption and hydrogen finishing address different contaminant classes and create different residual streams.
Read article →How to qualify RRBO quality and consistency
A single certificate of analysis is a batch snapshot. Dependable RRBO procurement requires an intended-use specification, multi-batch evidence, process control, contamination screening and formal change management.
Read article →Formulating finished lubricants with re-refined base stocks
RRBO can support technically sound finished lubricants, but it must enter the formulation through controlled base-stock qualification, current interchange rules and performance validation.
Read article →Used oil is not one legal category
Used-oil regulation changes across jurisdictions and across the material's journey. Collection, treatment, movement, end-of-waste status and finished-lubricant claims require separate evidence.
Read article →Can an RRBO project make commercial sense?
No universal RRBO return exists. Viability depends on controlled feedstock, achieved yield, plant configuration, product quality, residue cost, customer qualification and contracted demand.
Read article →When is RRBO environmentally better?
RRBO can offer environmental benefits, but the result depends on the question, geography, process, energy system, allocation method, product performance and comparator.
Read article →Mass balance needs a declared boundary
A circular-content claim should identify the facility, accounting period, inputs, outputs, losses and allocation method.
Reference noteColour is not a complete RRBO quality measure
Colour can support consistency monitoring, but performance-relevant qualification requires a wider controlled property set.
Reference noteTechnical Guidelines on Used Oil Re-Refining or Other Re-Uses of Previously Used Oil
International technical guidance on environmentally sound collection, handling, storage, treatment, re-refining and alternative uses. It is guidance, not a finished-lubricant specification.
- Identifier
- Basel technical guideline
- Scope
- International
- Status
- Adopted non-binding guidance
Waste Framework Directive: waste-oil provisions
Defines waste oils and regeneration. Article 21 addresses separate collection, regeneration priority and mixing that impedes regeneration or equivalent recycling.
- Identifier
- Directive 2008/98/EC
- Scope
- European Union
- Status
- In force; consolidated 16 Oct 2025
Best Available Techniques Reference Document for Waste Treatment
Covers waste reception, sampling, storage, oil-water separation and waste-oil re-refining alongside other treatment activities.
- Identifier
- Waste Treatment BREF
- Scope
- European Union
- Status
- Published reference document
Standards for the Management of Used Oil
US federal requirements for generators, collection points, transporters, processors, re-refiners, burners and marketers. Subpart F covers processors and re-refiners.
- Identifier
- 40 CFR Part 279
- Scope
- United States
- Status
- Current federal regulation
Guide for Characterizing Hydrocarbon Lubricant Base Oils
Identifies test methods for hydrocarbon base oils derived from crude refining and used-oil re-refining. It is a characterisation guide, not a finished-oil approval.
- Identifier
- ASTM D6074-15(2022)
- Scope
- International voluntary standard
- Status
- Active; reapproved 2022
EPA updates business guidance on managing used oil
The updated guidance clarifies Part 279 application, specification used oil, storage, hazardous-waste mixtures and processing. State rules may be stricter.
Open primary source ↗ATIEL Issue 26 adds a statement on re-refined base stocks
The code addresses re-refined base stocks in automotive engine oils and clarifies audit requirements. It does not create automatic approval for an RRBS-containing formulation.
Open primary source ↗Basel Convention adopts a revised Annex IV
The amendment identifies R9 as recycling or re-refining of used oil. It is scheduled to become effective on 1 January 2030.
Open primary source ↗CENTRE MANDATE
Evidence before assumption.
Circularity succeeds or fails across the complete chain. This centre examines collection systems, feedstock contamination, process choices, product consistency, market acceptance and the evidence behind environmental claims.
CORE COVERAGE
- ULO collection and chain of custody
- Water, fuel, glycol, solvent and metal contamination
- Re-refining process families
- RRBO quality and consistency
- Finished-lubricant formulation
- Regulation, economics and lifecycle evidence
10-ARTICLE RESEARCH SERIES
From ULO collection to credible RRBO performance.
10 practical research articles covering collection design, custody, contamination, re-refining technology, product qualification, regulation, economics and environmental evidence.
- RESEARCH 01
Designing a ULO collection system that protects feedstock value
A practical architecture for linking generation points, authorised collection, segregated storage, transport and verified treatment without treating collection volume alone as proof of circularity.
ULO collectionsegregationproduct stewardship8 MIN READ → - RESEARCH 02
From generator to guard tank: chain of custody for ULO
A control framework connecting every physical load, sample, tank movement and processing record while explaining why mass balance alone cannot prove material identity.
chain of custodymass balancetraceability7 MIN READ → - RESEARCH 03
Contamination triage for ULO: water, fuel, glycol, solvents and metals
A staged screening framework for safe unloading and feedstock routing that explains both the value and limitations of common laboratory tests.
contaminationlaboratory testingfeedstock routing8 MIN READ → - RESEARCH 04
Feedstock sampling and acceptance specifications for re-refining
How to build a defensible incoming-feed specification covering representative sampling, analytical methods, decision rules, quarantine and supplier performance.
samplingacceptance specificationsupplier control8 MIN READ → - RESEARCH 05
What re-refining processes actually remove
Re-refining is a treatment train, not a single purification step. Pretreatment, distillation, extraction, adsorption and hydrogen finishing address different contaminant classes and create different residual streams.
re-refiningprocess technologyresidue management8 MIN READ → - RESEARCH 06
How to qualify RRBO quality and consistency
A single certificate of analysis is a batch snapshot. Dependable RRBO procurement requires an intended-use specification, multi-batch evidence, process control, contamination screening and formal change management.
RRBO qualityconsistencysupplier qualification8 MIN READ → - RESEARCH 07
Formulating finished lubricants with re-refined base stocks
RRBO can support technically sound finished lubricants, but it must enter the formulation through controlled base-stock qualification, current interchange rules and performance validation.
finished lubricantsbase-oil interchangeperformance claims9 MIN READ → - RESEARCH 08
Used oil is not one legal category
Used-oil regulation changes across jurisdictions and across the material's journey. Collection, treatment, movement, end-of-waste status and finished-lubricant claims require separate evidence.
used-oil regulationwaste classificationcompliance8 MIN READ → - RESEARCH 09
Can an RRBO project make commercial sense?
No universal RRBO return exists. Viability depends on controlled feedstock, achieved yield, plant configuration, product quality, residue cost, customer qualification and contracted demand.
project economicsprocurementmarket acceptance9 MIN READ → - RESEARCH 10
When is RRBO environmentally better?
RRBO can offer environmental benefits, but the result depends on the question, geography, process, energy system, allocation method, product performance and comparator.
lifecycle assessmentenvironmental claimscarbon evidence9 MIN READ →
EDITORIAL PROGRAMME
What this centre will examine.
Coverage is maintained through verified explainers, comparisons, practitioner contributions and updated source registers.
Collection quality
Practical analysis of source segregation, storage, transport, contamination controls and traceability.
RRBO qualification
How volatility, oxidation stability, viscosity index, sulphur, colour and batch consistency affect formulation decisions.
Circularity claims
Clear boundaries for recycled content, mass balance, recovery yield and lifecycle comparisons.
PRACTICAL RESOURCES
Tools designed for disciplined decisions.
RRBO mass balance & screening calculator
Model ULO input, contamination, residues, recovered co-products, RRBO recovery and finished-product incorporation while exposing every assumption and data gap.
AVAILABLE NOW · VERSION 1.0Open tool →
Feedstock quality & disposition checklist
Create a collection-to-refinery control record covering load identity, segregation, sampling, acceptance evidence, exceptions and authorised disposition.
AVAILABLE NOW · VERSION 1.0Open tool →
TECHNICAL SAFEGUARDS
Boundaries that protect credibility.
- 01Use 'used lubricating oil' where material is suitable for controlled recovery
- 02Do not present RRBO as a finished-oil performance specification
- 03State geography and system boundaries for carbon comparisons
- 04Distinguish measured yield from illustrative scenarios
CONTRIBUTE EVIDENCE
Help strengthen this knowledge centre.
Practitioners, standards specialists and technology providers may propose evidence-led contributions. Commercial interests must be disclosed.
Propose a contribution →