Buick Somerset
Maintenance specs for 2 variants of the Buick Somerset — from 1985 to 1987.
1985–1987 Buick Somerset
2.5L I4 (Tech IV) · FWD
92 hp / 134 lb-ft
Transmission
Type3-Speed Automatic (3T40)
FluidDexron III
Drain & fill6 qt
Full capacity10 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Fuel
Tank13.6 gal
TypeRegular 87
Service Intervals
Oil change3,000 mi
Trans service30,000 mi
Coolant flush30,000 mi
Spark plugs30,000 mi
Timinggear (no scheduled replacement)
Air filter45,000 mi
Cabin filter22,500 mi
Drive belt45,000 mi
1985–1987 Buick Somerset
3.0L V6 (LN7) · FWD
125 hp / 160 lb-ft
Transmission
Type3-Speed Automatic (3T40)
FluidDexron III
Drain & fill6 qt
Full capacity10 qt
Power Steering
TypeHydraulic
FluidGM Power Steering Fluid
Fuel
Tank13.6 gal
TypeRegular 87
Service Intervals
Oil change3,000 mi
Trans service30,000 mi
Coolant flush30,000 mi
Spark plugs30,000 mi
Timingchain (no scheduled replacement)
Air filter45,000 mi
Cabin filter22,500 mi
Drive belt45,000 mi