The Toyota A25A-FKS engine has been an industry-leading power train since its inception in 2017. Installed in many leading cars such as the Camry, RAV4 and Lexus ES250, it is renowned for its efficient yet powerful performance. What’s more, for those looking for a greener option, there is also a bioethanol variant available under the index A25A-FKB. This not only lowers emissions but can also improve acceleration and fuel economy. The series also includes the A25A-FXS engine, offering additional reliable performance. In all, these modern engines provide car owners with an excellent driving experience that is both safe and efficient.
Cylinder Block
- The Toyota A25A-FKS engine features an open-deck aluminum alloy cylinder block with incorporated sleeves.
- Crankshaft has 8 typical counterweights and one toothed gear to power the crank balancer linked to the engine block below.
- Water cooling on front of #1 cylinder is absent; oil & antifreeze channels combined for improved heat transmission.
- Sloping coolant ducts along with spacer in water jacket enable intensive coolant circulation, enhancing heat dissipation and load distribution.
- High-strength connecting rods and lightweight T-shape resin coated pistons used, plus DLC coating on compression & rings.
- Oil system improved, second generation variable pressure oil pump controlled by ECM electronics.
Cylinder Head
- Toyota A252A-FKS engine features an aluminum 16-valve cylinder head, with two separate camshafts encased in alloy and lubricated by an oil supply system.
- Intake port is laser-clad whilst exhaust port has a pressed valve seat.
- Camshafts operate through roller rocker arms and tappets maintain zero valve clearance.
- Low-friction single-row timing chain drives the intake and exhaust camshafts.
- Engine incorporates Toyota’s Dual Variable Valve Timing system, with the intake camshaft controlled by an electronic actuator (VVT-iE) and the exhaust camshaft by a hydraulic VVT actuator.
- Extra cam on exhaust for high-pressure fuel pump.
Engine specifications for Toyota A25A-FKS 2.5 D-4S
| Displacement | 2487 cc |
| Power system | D4-S combined injection |
| Engine power | 200 – 210 hp |
| Torque | 240 – 250 Nm |
| Cylinder block | Aluminum R4 |
| Cylinder head | Aluminum 16v |
| Cylinder diameter | 87.5 mm |
| Stroke | 103.4 mm |
| Compression ratio | 13.0 |
| Hydraulic compensators | Yes |
| Timing Chain/Belt | Timing Chain |
| Variable Valve Timing (VVT) | VVT-iE + VVT-i |
| Turbocharger | No |
| Oil capacity/Recommended oil | 4.5 l 0W-20 |
| Fuel type | Medium/Plus |
| Euro class | EURO 6 |
| Average lifespan | 250 000 km |
Fuel consumption Toyota A25A-FKS
The Toyota Camry 2021 with automatic transmission as an example (l/100km):
| City | 9.3 l |
| Highway | 5.4 l |
| Combined | 6.8 l |
Which cars have the A25A-FKS 2.5 l engine
| Avalon 5 (XX50) | 2018 – … |
| Camry 8 (XV70) | 2017 – … |
| RAV4 5 (XA50) | 2018 – … |
| ES250 7 (XZ10) | 2018 – … |
| NX250 2 (AZ20) | 2021 – … |
Toyota A25A-FKS 2.5 Problems & Reliability
The Toyota A25A-FKS 2.5 D-4S Engine boasts a unique, intricate design which includes an extensive selection of small parts that are constantly prone to fail. As such, the quality of components and their precise assembly contribute greatly to the engine’s dependability and avoid premature deterioration. Furthermore, laser-clad seats in the head, as well as cast-in cylinder sleeves, have been found to be underwhelming in terms of longevity, significantly impacting the engine’s reliability and increasing its chances of failing before it exceeds 150,000-200,000 miles.
1 Comment
Syed H · 24/12/2023 at 07:07
I thought the recommended oil was 0w-16 for this engine . No?