Engine Volvo B6304S

The 3.0-liter 24-valve Volvo B6304S engine was assembled by the company from 1990 to 1999 and was installed on the popular 960 model in Europe and the similar S90 sedan and V90 station wagon. Modifications of this motor with a catalyst were known under the indices B6304F and B6304FS.

The 6-cylinder Modular engine family includes: B6284T, B6294S and B6294T.

The engine was installed on:

  • Volvo 960 in 1990 – 1996;
  • Volvo S80 I (184) in 1998 – 1999;
  • Volvo S90 I (964) in 1996 – 1998;
  • Volvo V90 I (235) in 1996 – 1998.


Production years 1990-1999
Displacement, cc 2922
Fuel system injector
Power output, hp 204
Torque output, Nm 267
Cylinder block aluminum R6
Block head aluminum 24v
Cylinder bore, mm 83
Piston stroke, mm 90
Compression ratio 10.7
Features DOHC
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 5.8
Fuel type petrol
Euro standards EURO 2
Fuel consumption, L/100 km (for Volvo 960 1994)
— city
— highway
— combined
Engine lifespan, km ~350 000

Disadvantages of the B6304S engine

  • This unit does not have a phase regulator and an electronic choke and is therefore reliable;
  • In specialized forums, oil consumption due to clogged crankcase ventilation is most often discussed;
  • Also, lubricant leaks often occur here, especially from the rear crankshaft oil seal;
  • Carefully monitor the condition of the timing belt, because when it breaks, the valves bend;
  • The engine mounts, water pump and fuel pump are distinguished by a low resource.

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