Isuzu Ascender
Maintenance specs for 4 variants of the Isuzu Ascender — from 2003 to 2008.
2003–2006 Isuzu Ascender
4.2L I6 (LL8) · RWD
275 hp / 275 lb-ft
Transmission
Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Rear fluid75W-90 GL-5
Fuel
Tank22 gal
TypeRegular 87
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Brake fluid30,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Drive belt60,000 mi
2003–2006 Isuzu Ascender
4.2L I6 (LL8) · 4WD
275 hp / 275 lb-ft
Transmission
Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Front fluid80W-90 GL-5
Rear fluid75W-90 GL-5
Transfer Case
FluidAuto-Trak II Fluid
Fuel
Tank22 gal
TypeRegular 87
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Brake fluid30,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Drive belt60,000 mi
2005–2008 Isuzu Ascender
5.3L V8 (LM4) · RWD
300 hp / 321 lb-ft
Transmission
Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Rear fluid75W-90 GL-5
Fuel
Tank22 gal
TypeRegular 87
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Brake fluid30,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Drive belt60,000 mi
2005–2008 Isuzu Ascender
5.3L V8 (LM4) · 4WD
300 hp / 321 lb-ft
Transmission
Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Front fluid80W-90 GL-5
Rear fluid75W-90 GL-5
Transfer Case
FluidAuto-Trak II Fluid
Fuel
Tank22 gal
TypeRegular 87
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Brake fluid30,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Drive belt60,000 mi