1999 GMC Yukon 5.7 Engine Specs
The 1999 GMC Yukon is equipped with a robust 5.7-liter V8 engine, known for its reliability and performance. This engine is part of the General Motors’ small-block family, which has been a staple in many of their vehicles. Below are the detailed specifications for the 5.7 engine found in the 1999 GMC Yukon.
| Specification | Details |
|---|---|
| Engine Type | 5.7L V8 (L31) |
| Displacement | 5.7 liters (350 cubic inches) |
| Horsepower | 255 hp @ 4,600 rpm |
| Torque | 330 lb-ft @ 3,200 rpm |
| Compression Ratio | 9.4:1 |
| Fuel System | Sequential Fuel Injection |
| Ignition System | Distributor-less Ignition System (DIS) |
| Fuel Type | Regular Unleaded (87 octane) |
| Max Engine Speed | 5,200 rpm |
| Engine Block Material | Cast Iron |
| Engine Head Material | Aluminum |
Engine Configuration
The 5.7-liter V8 engine in the 1999 GMC Yukon features a traditional V8 configuration, which is known for its smooth operation and power delivery. Here are some key aspects of its configuration:
Key Features
- V8 Configuration: The engine has eight cylinders arranged in a V shape, providing a balance of power and smoothness.
- Overhead Valve (OHV): The engine uses a pushrod design with overhead valves, which contributes to its compact size and weight.
- Cast Iron Block: The engine block is made from cast iron, ensuring durability and longevity.
- Aluminum Cylinder Heads: The use of aluminum for the cylinder heads helps reduce weight and improve heat dissipation.
- Sequential Fuel Injection: This system optimizes fuel delivery for improved efficiency and performance.
Engine Oil Specs & Service Intervals
Proper maintenance of the engine oil is crucial for the longevity and performance of the 1999 GMC Yukon’s 5.7 engine. Below are the specifications for engine oil and recommended service intervals.
Engine Oil Specifications
| Specification | Details |
|---|---|
| Oil Type | SAE 5W-30 |
| Oil Capacity (with filter) | 6 quarts (5.7 liters) |
| Oil Filter | AC Delco PF46 or equivalent |
| Oil Change Interval | 3,000 to 5,000 miles (4,800 to 8,000 km) |
Service Intervals
To maintain optimal performance, it is essential to adhere to the following service intervals:
- Oil Change: Every 3,000 to 5,000 miles or every 3 months, whichever comes first.
- Oil Filter Replacement: Replace with every oil change.
- Coolant Flush: Every 30,000 miles or as needed.
- Transmission Fluid Change: Every 30,000 to 60,000 miles.
- Fuel Filter Replacement: Every 30,000 miles.
Conclusion
The 1999 GMC Yukon’s 5.7-liter V8 engine is a well-engineered powerplant that offers a balance of performance, reliability, and ease of maintenance. Understanding the engine specifications, configuration, and oil service intervals is essential for any owner looking to keep their vehicle in top condition. Regular maintenance and using the recommended oil type will ensure that the engine continues to perform effectively for years to come.
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