Porsche 928
Maintenance specs for 3 variants of the Porsche 928 — from 1985 to 1995.
1985–1991 Porsche 928
5.0L V8 — 4-Speed Automatic (M28.42) · RWD
288 hp / 317 lb-ft
Transmission
Type4-Speed Automatic (A28)
FluidDexron III ATF
Drain & fill4 qt
Full capacity9 qt
Power Steering
TypeHydraulic
FluidPentosin CHF 11S
Capacity20 oz
Differentials
Rear fluidSAE 90 GL-5
Rear capacity2 qt
Fuel
Tank22.7 gal
TypePremium 91
Service Intervals
Oil change10,000 mi
Trans service30,000 mi
Coolant flush30,000 mi
Brake fluid24,000 mi
Spark plugs15,000 mi
Timingbelt — replace at 30,000 mi
Air filter15,000 mi
Drive belt30,000 mi
1985–1991 Porsche 928
5.0L V8 — 5-Speed Manual (M28.42) · RWD
288 hp / 317 lb-ft
Transmission
Type5-Speed Manual (G28)
FluidSAE 80W-90 GL-4
Drain & fill2.6 qt
Full capacity2.6 qt
Power Steering
TypeHydraulic
FluidPentosin CHF 11S
Capacity20 oz
Differentials
Rear fluidSAE 90 GL-5
Rear capacity2 qt
Fuel
Tank22.7 gal
TypePremium 91
Service Intervals
Oil change10,000 mi
Trans service30,000 mi
Coolant flush30,000 mi
Brake fluid24,000 mi
Spark plugs15,000 mi
Timingbelt — replace at 30,000 mi
Air filter15,000 mi
Drive belt30,000 mi
1992–1995 Porsche 928
5.4L V8 GTS (M28.49) · RWD
345 hp / 369 lb-ft
Transmission
Type5-Speed Manual (G28/47)
FluidSAE 80W-90 GL-4
Drain & fill2.6 qt
Full capacity2.6 qt
Power Steering
TypeHydraulic
FluidPentosin CHF 11S
Capacity20 oz
Differentials
Rear fluidSAE 90 GL-5
Rear capacity2 qt
Fuel
Tank22.7 gal
TypePremium 91
Service Intervals
Oil change10,000 mi
Trans service30,000 mi
Coolant flush30,000 mi
Brake fluid24,000 mi
Spark plugs15,000 mi
Timingbelt — replace at 30,000 mi
Air filter15,000 mi
Drive belt30,000 mi