1998 Porsche Boxster AutomaticFACTORY OEM SERVICE PROCEDURE

Lubrication Specifications

LUBRICATION SPECIFICATIONS

Material Condition Specification
Engine Oil (1) Synthetic Based Oil With Ambient Temperatures Mostly Higher Than 50°F (10°C) SAE 10W-40, SAE 15W-40, SAE 15W-50
Engine Oil (1) Synthetic Based Oil With Ambient Temperatures Mostly Lower Than 14°F (-10°C) SAE 10W-40, SAE 10W-30, SAE 5W-30 (2)
Engine Oil (1) Mineral Based Oil With Ambient Temperatures Mostly Higher Than 50°F (10°C) SAE 15W-40, SAE 20W-50, SAE 20W-40
Engine Oil (1) Mineral Based Oil With Ambient Temperatures Mostly Below 50°F (10°C) SAE 15W-40, SAE 10W-40, SAE 10W-30
Engine Oil (1) Mineral Based Oil With Ambient Temperatures Mostly Lower Than 14°F (-10°C) SAE 10W-30, SAE 5W-30 (2)
Manual Transmission & Differential All SAE 75W-90
Tiptronic S All ATF-Dexron II D
Differential With Tiptronic S All SAE 75W-90
Power Steering Fluid All Pentosin Hydraulic Fluid CHF 11 S
Brake Fluid All Original Porsche Brake Fluid
(1) Engine oils should preferably be used as synthetic or semisynthetic. Use only engine oils labelled as API SH or ILSAC GF-1 and viscosity grades of SAE 10W-40 or higher.
(2) For continuous weather conditions with ambient temperatures mostly below 32°F (0°C) use SAE 5W-30.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.