API SQ in 2026: Verify the Grade, Claim and Licence Before Buying
An API SQ description is a starting point for an engine-oil enquiry, not a complete approval record. A distributor or fleet buyer still has to match the exact viscosity grade and application, identify the quoted brand/pr
An API SQ description is a starting point for an engine-oil enquiry, not a complete approval record. A distributor or fleet buyer still has to match the exact viscosity grade and application, identify the quoted brand/product and check the evidence behind each performance or licence claim. Treat a category upgrade and a viscosity change as separate decisions.
The current change and its scope
API 1509, twenty-third edition dated February 2025, sets out the SQ/GF-7 licensing framework introduced on 31 March 2025. API category, ILSAC qualification and viscosity are distinct checks. GF-7B’s 0W-16 scope must not be treated as a universal substitution instruction. Source: American Petroleum Institute — 2025-02.
Start with the engine requirement
Copy the vehicle or engine manual requirement into the enquiry, including SAE viscosity, the specified performance category and any OEM requirement. A newer category name does not authorize every viscosity or every engine application. If the purchasing change also changes grade or brand, record those changes explicitly and ask for an application-specific response.
Verify the claim at the brand-and-product level
Ask whether the offer is a performance claim or a licensed product, then verify any asserted API licence against the exact marketed product and grade. A company name, sample bottle or family-level catalogue description is not enough to resolve a different private-label offer. Likewise, do not infer ILSAC GF-7A or Resource Conserving from API SQ alone. Request the exact claim and its supporting document before printing packaging.
| Buyer check | Question to resolve | Evidence to request |
|---|---|---|
| SAE grade | Required viscosity for the actual engine | Manual requirement and exact-grade TDS |
| API claim | Performance description versus licensed marking | Exact brand/product/grade and licence evidence |
| ILSAC claim | GF-7A/GF-7B or no such claim | Explicit qualification, not category-name inference |
| Private label | Which product name will be sold | Agreed marking and document responsibility |
Connect the assessment to the actual enquiry
The MOS API SQ engine-oil page provides the relevant enquiry route. Its catalogue wording is not independent verification of API licensing or OEM approval. Compare the offered grade against your actual application, not against a broad “newer is better” claim.
Supporting product/category route: Fully synthetic engine oil API SP ILSAC GF-6 5W-30. Confirm its exact scope before adding it to the same procurement specification.
Prepare a specific RFQ
For an RFQ, provide vehicle/engine use, required SAE grade, API/ILSAC and OEM requirements, current oil, brand or private-label plan, quantity, packaging and destination. Request the exact-grade TDS/SDS and evidence for any licence/approval statement. Agree what may appear on labels; no universal fuel-saving or service-interval promise follows from this article.
Buyer questions
Does API SQ alone mean GF-7A?
Do not assume it. Request the exact ILSAC or Resource Conserving claim and supporting qualification.
Can 0W-16 replace any gasoline-engine oil?
No. Check the engine requirement; GF-7B is not a universal viscosity substitution instruction.
Does a product title prove an API licence?
No. Verify the claimed licence for the exact marketed brand, product and grade.
What information is needed for an SQ oil quotation?
Provide engine requirements, viscosity, performance and OEM requirements, private-label plans, quantity, packaging, destination and document needs.