CARFIX

Mitsubishi Diamante 6G72 (DOHC 24V) Sedan 140kW (1999–2004)

Welcome to the CARFIX Vehicle Wiki for the MITSUBISHI DIAMANTE Base. This guide provides valuable information to help you understand and maintain your Diamante, a popular choice in New Zealand for those seeking a comfortable and well-equipped mid-size sedan. Whether you're a seasoned owner or considering purchasing one, this resource offers insights into common issues, servicing recommendations, and WOF (Warrant of Fitness) considerations.

Parts for the Mitsubishi Diamante 6G72 (DOHC 24V) Sedan 140kW

Known issues

Owners of the MITSUBISHI DIAMANTE Base should be aware of potential issues such as automatic transmission problems (harsh shifting), engine oil leaks (valve stem seals), and climate control LCD failure. These issues often become apparent between 150,000 and 250,000 kilometers.

WOF tips

When preparing your MITSUBISHI DIAMANTE Base for its WOF, pay close attention to rust around the rear wheel arches and the condition of the rear suspension bushes, as these are common failure points.

About the Mitsubishi Diamante 6G72 (DOHC 24V) Sedan 140kW

Here's a look at what owners should keep in mind regarding their Diamante Base:

Servicing and Maintenance:

Regular maintenance is crucial for keeping your Diamante in top condition. Consider these components as part of your maintenance schedule:
• Filtration: Regular replacement of the air filter and automatic transmission filter will help ensure engine and transmission longevity.
• Fluid Checks: Keep an eye on engine oil levels, and be prepared to replace the engine oil pan gasket if leaks develop. Coolant hoses, like the radiator hose upper, should be inspected for wear and replaced as needed.
• Belts & Hoses: Inspect the drive belt for the power steering system for cracks or wear, and replace it to prevent potential power steering failure.
• Suspension & Steering: Components such as suspension bushes (rear control arm - upper and lower) and the steering idler arm can wear over time, affecting handling and ride quality. Replacement may be necessary.
• Braking System: The brake shoe handbrake should be inspected for wear during regular service.
• Exhaust System: Oxygen sensors play a key role in fuel efficiency and emissions control. Address any issues promptly.
• Sealing: Consider that the conversion gasket set is crucial when servicing the vehicle.

Common Issues:
• Owners have reported automatic transmission issues, often manifesting as harsh shifting, typically around 150,000-250,000 km. Regular transmission servicing can help mitigate these problems.
• Engine oil leaks, particularly from valve stem seals, are another potential concern in higher-mileage Diamantes.
• Failure of the climate control LCD screen is also reported.

WOF Considerations:
• Rust, particularly around the rear wheel arches, is a common WOF failure point.
• Worn rear suspension bushes can also lead to WOF failures. Regular inspection and timely replacement are recommended.

Questions owners ask

What are the most common issues I should look out for with my 1999-2002 Mitsubishi Diamante?
Owners of the 1999-2002 Mitsubishi Diamante often report automatic transmission issues, such as harsh shifting, typically appearing between 150,000 and 250,000 km. Engine oil leaks, particularly from valve stem seals, and climate control LCD screen failures are also common concerns for higher-mileage vehicles.
What maintenance should I prioritise to keep my Diamante running smoothly?
Regular maintenance is key for your Diamante. Focus on routine replacement of the air filter and automatic transmission filter for engine and transmission longevity. Inspect and replace coolant hoses like the radiator hose upper as needed, and check the drive belt for the power steering system for wear to prevent power steering failure. Don't forget to monitor engine oil levels and address any leaks from the engine oil pan gasket promptly.
What should I check on my Mitsubishi Diamante before its WOF inspection?
For your Mitsubishi Diamante's WOF, pay close attention to rust, especially around the rear wheel arches, as this is a common failure point. Also, ensure the rear suspension bushes (upper and lower control arm) are in good condition, as worn bushes can lead to WOF failures. The brake shoe handbrake should also be inspected for wear.
Where can I get replacement suspension bushes for my 1999-2002 Mitsubishi Diamante in NZ?
CARFIX stocks 326 SKUs for the 1999-2002 Mitsubishi Diamante. You can find replacement suspension bushes, including those for the rear control arm (upper and lower), directly through CARFIX. We also have DIY guides available to assist with some repairs.
Are there any specific engine oil leak issues with the Mitsubishi Diamante?
Yes, engine oil leaks are a potential concern, particularly from valve stem seals, especially in higher-mileage 1999-2002 Mitsubishi Diamantes. It's also wise to keep an eye on the engine oil pan gasket for any signs of leakage.
How often should I service my Mitsubishi Diamante?
The recommended service interval for your Mitsubishi Diamante is every 10,000 km. Adhering to this schedule, and focusing on items like filter replacements and fluid checks, will help maintain your vehicle's condition.