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Isuzu Ascender

Maintenance specs for 4 variants of the Isuzu Ascender — from 2003 to 2008.

20032006 Isuzu Ascender

4.2L I6 (LL8) · RWD

275 hp / 275 lb-ft

Engine Oil

Weight5W-30
Capacity7 qt

Transmission

Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt

Coolant

TypeDex-Cool (orange)
Capacity14.8 qt
Shop coolant

Brake Fluid

TypeDOT 3
Shop DOT 3

Power Steering

TypeHydraulic
FluidGM Power Steering Fluid

Differentials

Rear fluid75W-90 GL-5

Fuel

Tank22 gal
TypeRegular 87

Tires

Size245/65R17
Pressure (front)35 PSI
Pressure (rear)35 PSI
Shop 245/65R17 tires

Battery

Group size75
CCA690 A
Shop group 75 battery

Spark Plugs

Gap0.042 in
Shop spark plugs

Wiper Blades

Driver22"
Passenger22"
Rear16"
Shop wiper blades

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

20032006 Isuzu Ascender

4.2L I6 (LL8) · 4WD

275 hp / 275 lb-ft

Engine Oil

Weight5W-30
Capacity7 qt

Transmission

Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt

Coolant

TypeDex-Cool (orange)
Capacity14.8 qt
Shop coolant

Brake Fluid

TypeDOT 3
Shop DOT 3

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

Tires

Size245/65R17
Pressure (front)35 PSI
Pressure (rear)35 PSI
Shop 245/65R17 tires

Battery

Group size75
CCA690 A
Shop group 75 battery

Spark Plugs

Gap0.042 in
Shop spark plugs

Wiper Blades

Driver22"
Passenger22"
Rear16"
Shop wiper blades

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

20052008 Isuzu Ascender

5.3L V8 (LM4) · RWD

300 hp / 321 lb-ft

Engine Oil

Weight5W-30
Capacity6 qt

Transmission

Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt

Coolant

TypeDex-Cool (orange)
Capacity15.2 qt
Shop coolant

Brake Fluid

TypeDOT 3
Shop DOT 3

Power Steering

TypeHydraulic
FluidGM Power Steering Fluid

Differentials

Rear fluid75W-90 GL-5

Fuel

Tank22 gal
TypeRegular 87

Tires

Size245/65R17
Pressure (front)35 PSI
Pressure (rear)35 PSI
Shop 245/65R17 tires

Battery

Group size75
CCA690 A
Shop group 75 battery

Spark Plugs

Gap0.04 in
Shop spark plugs

Wiper Blades

Driver22"
Passenger22"
Rear16"
Shop wiper blades

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

20052008 Isuzu Ascender

5.3L V8 (LM4) · 4WD

300 hp / 321 lb-ft

Engine Oil

Weight5W-30
Capacity6 qt

Transmission

Type4-Speed Automatic (4L60-E)
FluidDexron III ATF
Drain & fill5 qt
Full capacity11.2 qt

Coolant

TypeDex-Cool (orange)
Capacity15.2 qt
Shop coolant

Brake Fluid

TypeDOT 3
Shop DOT 3

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

Tires

Size245/65R17
Pressure (front)35 PSI
Pressure (rear)35 PSI
Shop 245/65R17 tires

Battery

Group size75
CCA690 A
Shop group 75 battery

Spark Plugs

Gap0.04 in
Shop spark plugs

Wiper Blades

Driver22"
Passenger22"
Rear16"
Shop wiper blades

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