When choosing a Lexus RX 2008, paying attention to specific trims and their associated features, as well as common issues, can significantly enhance your ownership experience. Below is a breakdown of the RX 2008 model across its trims, potential weak points, common issues, diagnostics, ownership experience, and recommendations for long-term reliability.

Trims Breakdown

The 2008 Lexus RX is offered in several trims: RX 350, RX 400h (the hybrid variant), and RX 450h (although primarily 2006-2008 is discussed here, the 450h appeared later). Below, we analyze each trim.

1. RX 350

• Weak Points:
  • The 3.5L V6 engine (2GR-FE) is known for oil consumption issues, particularly around 100,000-120,000 miles.
  • Some users report transmission roughness and delayed shifting (around 80,000-100,000 miles).
• Common Issues:
  • Engine: Oil burning and potential sludge buildup if not maintained properly.
  • Transmission: Potential for shifting issues; sometimes related to transmission fluid degradation.

2. RX 400h (Hybrid)

• Weak Points:
  • Complexity of hybrid systems may lead to higher repair costs.
  • Battery life is a concern; hybrid batteries can fail around 80,000-100,000 miles, though many last longer.
• Common Issues:
  • Engine: Similar oil consumption concerns as the RX 350; the hybrid system can throw warning lights.
  • Electronics: Battery monitoring systems need monitoring, particularly over time.

Common Issues Across All Models

Engine

• Oil Consumption: As noted, consumption can start occurring after 100,000 miles.
• Intake Manifold: Sounds of a rattling intake can occur, pointing to a failure.

Transmission

• Delayed Shifting: Common around 80,000-100,000 miles.
• Fluid Leaks: Older models may experience fluid leaks if seals deteriorate.

Suspension

• Worn Bushings: Commonly may need replacement after 100,000 miles.
• Struts/Shocks: Prone to wear and deterioration.

Electronics

• Dashboard Warning Lights: Can indicate various issues, including hybrid system alerts in the 400h.
• Navigation/Audio Systems: May start failing or exhibit glitches as the vehicle ages.

Diagnostics to Detect Issues

1. Visual Inspection: Check for fluid leaks under the vehicle, particularly from the engine and transmission.
2. Engine Oil Quality: Look for sludge and check the oil level; excessive consumption may indicate deeper problems.
3. Transmission Fluid: Ensure it's at the right level and is clean, not burnt.
4. Suspension Inspection: Test drive for any noises or bumpy rides, indicating worn suspension components.
5. OBD-II Scan Tool: Use it to check for trouble codes, especially related to the hybrid system in the RX 400h.
6. Battery Health (Hybrid models): Specific diagnostics can measure the health of the hybrid battery system.

Ownership Experience

Fuel Efficiency

• RX 350: Approximately 20 mpg city and 25 mpg highway.
• RX 400h: Superior with around 28 mpg city and 30 mpg highway thanks to the hybrid system.

Breakdown Frequency

• With regular maintenance, these vehicles are generally reliable but may see more frequent repairs post 100,000 miles due to wear and tear on critical components.

Ease of Maintenance

• Most Lexus dealerships provide excellent service networks, though independent shops might not always have the same level of expertise for hybrids.

Recommendations for Long-Term Reliability

• Regular Oil Changes: Every 5,000-7,500 miles with high-quality synthetic oil.
• Transmission Service: Regular fluid changes to prevent shifting issues.
• Battery Management: Especially for hybrid models, ensure periodic checks and maintenance.
• Suspension Care: Keep an eye on any signs of wear and replace as needed.

Parts and Services in the American Market

• Parts are generally available, though hybrid components (for RX 400h) can be more expensive.
• Lexus has a robust dealer network, and OEM parts are widely available through both dealerships and third-party retailers, helping keep maintenance costs reasonable.

Conclusion

When buying a used 2008 Lexus RX, consider the mileage, maintenance history, and if possible, a full inspection from a qualified mechanic. Focus on the engine oil consumption, transmission performance, hybrid system health (for RX 400h), and overall vehicle condition. Understanding these factors can help mitigate risks and ensure longevity in your investment.