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.
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HOMESERVICE MANUALSCHEVROLET1989R 20 P/U 2WD V8-454 7.4LREPAIR AND DIAGNOSISSPECIFICATIONSCAPACITY SPECIFICATIONSENGINE OILLIGHT DUTY MODELS
1989 Chevrolet R 20 P/U 2WD V8-454 7.4L
Light Duty Models
1989 Chevrolet R 20 P/U 2WD V8-454 7.4LSECTION Light Duty Models
Type SG
CAPACITY, Refill:
7.4L 4V ex. 1988 V30/35 5.7 Liters 6.0 Quarts
7.4L Others 1988-90 4.8 Liters 5.0 Quarts
7.4L 1991 5.7 Liters 6.0 Quarts
All others 3.8 Liters 4.0 Quarts
Capacity shown is without filter. When replacing filter, additional oil may be needed
7.4L:
Above 40°F (4°C) 30**
Above 0°F (-18°C) 10W-30*
Below 60°F (16°C) 5W-30
Others:
Above 40°F (4°C) 30**
Above 0°F (-18°C) 10W-30
All temperatures 5W-30*
*Preferred
**May be used only when other recommended viscosities are not available
RENDER: 1.0x
NO RELATED
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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.