Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Porsche 928 AutomaticFACTORY OEM SERVICE PROCEDURE
Quick Lookups: Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Refrigerant | 5.0L Eng | 2.09 LBS. | 0.94 KG | R-12 | S | ||
| Automatic Transmission Fluid | 5.0L Eng | 2.46 GALS. | 9.31 L | Automatic Transmission Fluid DEXRON | Manufacturer's approved fluid only. | S | |
| Brake Fluid | 5.0L Eng | 0.42 PTS. | 0.19 L | DOT 3 or DOT 4 Brake Fluid | Manufacturer's approved fluid only. | S | |
| Differential Gear Oil | 5.0L Eng | 0.80 GALS. | 3.02 L | API - GL-5, SAE 75W-90 Hypoid Gear Oil (MiL-L-2105 B) | Manufacturer's approved fluid only. | S | |
| Engine Coolant | 5.0L Eng | 4.23 GALS. | 16.01 L | Phosphate-free antifreeze containing Ethylene Glycol Antifreeze recommended for aluminum engines and radiators | Manufacturer's approved fluid only. | S | |
| Engine Oil | 5.0L Eng | 2.00 GALS. | 7.57 L | API - SAE 5W-20 (Below -20Deg.F to 15Deg.F), 5W-30 (-20Deg.F to 30Deg.F),10W-30 (-10Deg.F to 70Deg.F), 10W-40 (-5Deg.F to 95Deg.F), 15W-40 (5Deg.F to Above 100Deg.F), 20W-40/50 (15Deg.F to Above 100Deg.F) | Manufacturer's approved fluid only. | S | |
| Fuel Tank | 5.0L Eng | 23.00 GALS. | 87.06 L | S | |||
| Manual Transmission Fluid | 5.0L Eng | 1.20 GALS. | 4.54 L | API - GL-5 Hypoid Gear Oil, SAE 75W- 90 (Mil-L-2105 B) | Manufacturer's approved fluid only. | S | |
| Power Steering Fluid | 5.0L Eng | 0.74 QTS. | 0.7 L | Automatic Transmission Fluid DEXRON | Manufacturer's approved fluid only. | S | |
| Windshield Washer Fluid | 5.0L Eng | 2.00 GALS. | 7.57 L | Use a winter cleaner or summer cleaner depending on the season | Follow the Manufacturer's Instructions for the mixture ratio. | S | |
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.