Elemental similarity has a narrow conclusion
Similar calcium, magnesium, zinc, phosphorus or boron values do not disclose molecular architecture or prove finished-oil performance.
Reference noteKNOWLEDGE CENTRE 03
Additive Performance Centre
Chemical similarity is not proof of finished-lubricant performance.
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31 Jul 2026Last verified
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Chemical similarity is not performance equivalence
Elemental analysis and compositional resemblance can support an investigation. They cannot replace application-relevant performance evidence.
Read article →A practical additive-supplier qualification system
Qualification should connect technical evidence, manufacturing control, traceability and change management rather than rely on a one-time sample.
Read article →Matching treat rate does not match capability
Equal dosage can produce different reserve, compatibility and performance when component concentration or chemistry differs.
Reference noteQualification expires when key assumptions change
Site, process, raw-material or specification changes may require risk review and targeted requalification.
Reference noteEngine Oil Licensing and Certification System
Defines API's voluntary licensing framework, performance categories, quality marks, formulation controls and marketplace monitoring.
- Identifier
- API 1509, 24th Edition
- Scope
- API global licensing programme
- Status
- Current edition
ATC Code of Practice
Specifies engine-test procedures, registration, reference-oil practices, reporting and record keeping within the European quality system.
- Identifier
- ATC Code of Practice
- Scope
- European industry quality system
- Status
- Current version listed by ATC-ERC
ATIEL Code of Practice, Issue 26
Defines EELQMS development, manufacturing, claims, documentation and audit expectations, including a statement on re-refined base stocks.
- Identifier
- Issue 26
- Scope
- European industry quality system
- Status
- Current
Determination of Additive Elements by ICP-AES
Quantifies selected elements in unused oils and additive packages. It can support compositional checks but does not establish equivalent lubricant performance.
- Identifier
- ASTM D4951-14(2019)
- Scope
- International voluntary standard
- Status
- Active; reapproved 2019
Homogeneity and Miscibility in Automotive Engine Oils
Bench method for whether an engine oil remains homogeneous and miscible with specified reference oils after a temperature cycle. It is not a complete approval test.
- Identifier
- ASTM D6922-13(2025)
- Scope
- International voluntary standard
- Status
- Active; reapproved 2025
API publishes the 24th edition of API 1509
The current edition governs API engine-oil licensing, formulation controls, quality marks and marketplace monitoring.
Open primary source ↗ATC issues its June 2026 Code of Practice
ATC-ERC identifies the 1 June version as current. The code governs consistent engine-test operation, registration and reporting used in ACEA and EELQMS development work.
Open primary source ↗API SQ and ILSAC GF-7 become current gasoline-engine categories
API's guide identifies SQ, GF-7A and GF-7B and describes added coverage including aged-oil LSPI, timing-chain wear and deposit protection.
Open primary source ↗CENTRE MANDATE
Evidence before assumption.
This centre focuses on formulation integrity, validation and supplier qualification. It examines what evidence is needed before a component, package or reformulation can credibly be described as performance-equivalent.
CORE COVERAGE
- Chemical identity versus demonstrated performance
- Base-oil and additive interactions
- Bench, engine and equipment testing
- Seal, filterability and demulsibility risks
- Batch consistency and change control
- Supplier qualification and traceability
EDITORIAL PROGRAMME
What this centre will examine.
Coverage is maintained through verified explainers, comparisons, practitioner contributions and updated source registers.
Equivalence examined
Distinguish elemental similarity, treat-rate matching and physical-property comparison from validated application performance.
Failure-mode library
Evidence-led explanations of deposits, wear, foaming, air release, oxidation, seal issues, filtration and aftertreatment compatibility.
Responsible reformulation
Change-control expectations for component substitution, package changes and base-stock flexibility.
PRACTICAL RESOURCES
Tools designed for disciplined decisions.
Supplier qualification scorecard
Assess composition control, batch limits, technical evidence, compatibility, traceability and manufacturing-change notification.
FRAMEWORK IN DEVELOPMENTEvidence ladder
Show what conclusions can and cannot be supported by certificates, elemental analysis, bench tests, engine tests, approvals and field data.
FRAMEWORK IN DEVELOPMENTTECHNICAL SAFEGUARDS
Boundaries that protect credibility.
- 01Do not accuse or rank suppliers without verified evidence
- 02Do not equate chemical resemblance with approval
- 03Identify test scope and limitations
- 04Disclose commercial interests and supplier-provided information
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 →