The Nissan QR25 series has three main types: QR25DE, QR25DD, and QR25DER.
1. QR25DE (Base/Port Injection)
- Fuel system: Port fuel injection (multi-point).
- Power: ~170–180 hp (127–134 kW) / ~244 N·m.
- Key features: Aluminum block, DOHC, CVTC (variable valve timing), balance shafts.
- Common uses: Nissan Altima, X‑Trail, Rogue, Teana, Terra, Frontier


