API GF-6 becomes obsolete on 1 October 2026.

What the GF-6 transition means for your business

API’s Motor Oil Guide sets 1 October 2026 as the obsolescence date for ILSAC GF-6A and GF-6B. For lubricant suppliers, the immediate task is to check that product claims, supporting approvals and customer-facing information remain aligned.

Where GF-6A is recommended

Use GF-7A

Where GF-6B is recommended

Use GF-7B SAE 0W-16 only

Three priorities for brand owners and distributors

1. Verify the product and its claims.Review each affected SKU, viscosity grade, formulation reference and API licence. Confirm the applicable OEM requirements before changing a product recommendation.
2. Align every customer touchpoint.Check labels, technical data sheets, websites, distributor catalogues and tender documents against the same approved product information.
3. Manage stock and customer communication.Identify remaining packaging and finished goods by market. Assign an owner to each transition action and give customers clear guidance on the replacement product.

The commercial implication: A category becoming obsolete does not mean an oil suddenly loses its physical performance. It does require careful control of licensing, claims and the advice given to customers.