BYD Qin L DM-i Fuel Choice: Octane and Quality Differ

Fuel choice for the Qin L DM-i: grade and quality are separate questions

Scope: 2026 Qin L DM-i, China mainland; PDF p. 149; this article does not restate a single fuel grade

Check the two questions separately

This car's manual sets out the fuel requirement and explains that unsuitable fuel may affect the engine and emissions system. A name that matches the grade doesn't mean the source and quality can be trusted, and a higher price can't replace the vehicle's requirement. Owners should check both this car's exact fuel instructions and a legitimate supply channel, rather than following other owners' refuelling habits. ^[1]

Keeping receipts has a practical use

We suggest keeping the time of refuelling, the station, the product label and when any later problem appeared, so the service provider can check. A problem appearing after refuelling is only a timeline; it should not be recorded as proof that the fuel quality was bad. If the product identity is unclear, confirm it with the supplier, and don't add additives not approved for this car as a fix. ^[1]

Stop experimenting if there's a safety concern

If you smell fuel, see signs of a leak, or notice a serious loss of power or a warning, contact a professional service; don't keep filling up, extracting or mixing fuel to test at home. This article lists no cross-model grades, cleaner doses, emissions fault codes or fuel-line procedures; the basis for maintenance and diagnosis is confirmed by this car's documents together with an actual inspection. ^[1]

Sources

[Source 1] BYD China official website: 2026 Qin L DM-i Owner's Manual (in Chinese) (public PDF on the official website)
https://www.byd.com/material/domestic-official/user-manual/dynasty/2026%E6%AC%BE%E7%A7%A6L%20DM-i%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C20260417.pdf
Verified: 2026-10-03; page publication date not confirmed.

This article contains information-organising suggestions from the editorial team; it is not a manufacturer repair procedure.