Engine Jaguar AJ25

The Jaguar AJ25 2.5-liter gasoline engine was produced by the concern from 2001 to 2009 and was installed on the most popular models of the British company, such as the S-Type and X-Type. This motor was essentially one of the varieties of power units of the Duratec V6 family.

AJ-V6 series: AJ20, AJ25, AJ30.


Production years 2001-2009
Displacement, cc 2495
Fuel system distributed injection
Power output, hp 195 – 200
Torque output, Nm 240 – 250
Cylinder block aluminum V6
Block head aluminum 24v
Cylinder bore, mm 81.65
Piston stroke, mm 79.50
Compression ratio 10.5
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator on the intake shaft
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 5.9
Fuel type petrol
Euro standards EURO 3
Fuel consumption, L/100 km (for Jaguar X-Type 2009)
— city
— highway
— combined
Engine lifespan, km ~350 000
Weight, kg 170

The engine was installed on:

  • Jaguar S-Type 1 (X200) in 2002 – 2007;
  • Jaguar X-Type 1 (X400) in 2001 – 2009.

Disadvantages of the Jaguar AJ25 engine

  • The unit is quite reliable, but has many rare and expensive parts;
  • The main problems are associated with air leaks due to drying gaskets;
  • Also, the electrically driven geometry change system often fails in the intake;
  • The crankcase ventilation valve here requires regular cleaning or the lubricant will press from all the cracks;
  • At high mileage, oil consumption occurs due to the fault of stuck piston rings.

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