Cadillac STS
Maintenance specs for 3 variants of the Cadillac STS — from 2005 to 2011.
2005–2011 Cadillac STS
3.6L V6 (LY7) · RWD
255 hp / 252 lb-ft
Transmission
Type6-Speed Automatic (6L50)
FluidDexron VI
Drain & fill5.5 qt
Full capacity10 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Rear fluid75W-90 Synthetic GL-5
Fuel
Tank17.5 gal
TypePremium 91
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Cabin filter22,500 mi
Drive belt60,000 mi
2005–2011 Cadillac STS
3.6L V6 (LY7) · AWD
255 hp / 252 lb-ft
Transmission
Type6-Speed Automatic (6L50)
FluidDexron VI
Drain & fill5.5 qt
Full capacity10 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Front fluid75W-90 Synthetic GL-5
Rear fluid75W-90 Synthetic GL-5
Fuel
Tank17.5 gal
TypePremium 91
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Cabin filter22,500 mi
Drive belt60,000 mi
2005–2011 Cadillac STS
4.6L V8 Northstar (LH2) · RWD
320 hp / 315 lb-ft
Transmission
Type6-Speed Automatic (6L50)
FluidDexron VI
Drain & fill5.5 qt
Full capacity10 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Differentials
Rear fluid75W-90 Synthetic GL-5
Fuel
Tank17.5 gal
TypePremium 91
Service Intervals
Oil change5,000 mi
Trans service50,000 mi
Coolant flush150,000 mi
Spark plugs100,000 mi
Timingchain (no scheduled replacement)
Air filter30,000 mi
Cabin filter22,500 mi
Drive belt60,000 mi