This 1988 Porsche 928 factory service and repair manual is matched to the S4 trim, so the specifications and repair sequences inside are the ones Porsche published for this exact car rather than a generic 928-era approximation.
Trims
- S4 Coupe 2-Door
Known issues on the 1988 928. No recalls are on federal record for the 1988 928, and no complaints or technical service bulletins are logged for the year either.
With a clean federal record, this manual is your baseline for keeping the S4's V8 running to Porsche's original factory tolerances, not just a set of generic torque figures.
Information for PIWIS tester update 42.300.050 & .052
Instructions on manufactures certificate for approved Porsche A40 engine oils
Instructions on manufacturers certificate for approved C20 engine oils
Instructions on manufactures certificate for approved Porsche C30 engine oils
Information for PIWIS tester update 42.300.035
Information for PIWIS tester update 42.300.040 & .041
Information for PIWIS tester update 42.300.030 - .032
Parts information for parts withdrawal involving the glass roof - 9J0877069EY and 9J0877069DY
Showing the 8 most recent of 74 technical service bulletins on file with NHTSA.
