DUNSHUN LUBRICANTSAPI SQ Explained: What Changed From SP, and Why It Matters for GDI Engines
Short answer: API SQ (introduced with ILSAC GF-7) is the current highest API gasoline category. It tightens LSPI, timing-chain wear, oxidation and sludge protection versus API SP, and is designed for turbocharged GDI engines — including those with GPF/DPF aftertreatment when formulated low-SAPS (ACEA C5).
From SJ to SQ: Why Categories Keep Moving
Every API category upgrade answers a real engine trend:
| Category | Engine trend it answered |
|---|---|
| SJ → SL → SM → SN | Fuel economy, catalyst protection, longer drains |
| SN+ | Low-speed pre-ignition (LSPI) in turbo GDI engines |
| SP | Chain wear, deposit control, aftertreatment compatibility |
| SQ | Latest GDI turbo engines, GF-7 fuel economy, stricter oxidation & wear limits |
What SQ Adds in Practice
- Lower LSPI risk — turbo GDI engines can suffer destructive pre-ignition at low rpm / high load; SQ limits the oil-side contributors.
- Stricter timing-chain wear control — stretched chains are a costly failure on modern engines.
- Better oxidation and sludge resistance — which is what makes those longer OEM drain intervals safe.
- Fuel-economy alignment with ILSAC GF-7 — paired low-viscosity grades such as 0W-20 and 5W-30.
Compatibility Notes for Importers
- SQ oils are backward compatible with earlier API categories, so one flagship grade can cover a whole market.
- If your market's vehicles carry GPF/DPF, choose a low-SAPS formulation (ACEA C5-class, like POWER S900); otherwise mid-SAPS ACEA C3 (S800) covers most platforms.
- For hot-climate high-mileage fleets, SN+ 5W-40 (S700) remains a strong seller alongside SQ.
FAQ
Is API SQ oil safe for older cars? Yes — API categories are backward compatible.
Does SQ cost much more than SP? Premiums are modest; the additive package is close. As a private-label OEM customer you can position SQ as your flagship without breaking retail price points.
Which Dunshun grade is API SQ?POWER S900 — API SQ · ILSAC GF-7 · ACEA C5, in 5W-30 and 0W-20.
Importing engine oil? Compare grades in the product overview or get a quotation within 24 hours.