Are Nissan 370Z Reliable? | The VQ Story

The Nissan 370Z, with its robust VQ37VHR engine, generally offers solid reliability when properly maintained.

Stepping into a Nissan 370Z is an experience, a direct connection to the road with that signature VQ engine growl. Many drivers are drawn to its performance and styling, but a common question that pops up in the garage or over coffee is about its long-term durability. It’s a fair question for any enthusiast considering a sports car.

Are Nissan 370Z Reliable? Understanding the VQ37VHR Engine

At the heart of the 370Z is the VQ37VHR engine, a 3.7-liter naturally aspirated V6. This engine is part of Nissan’s highly regarded VQ series, known for its strong performance and, generally, its longevity. The VQ37VHR features Nissan’s Variable Valve Event and Lift (VVEL) system, which precisely controls valve timing and lift for improved power and fuel efficiency.

The VVEL system, while sophisticated, adds a layer of complexity compared to earlier VQ iterations. Its precise operation is key to the engine’s character and performance. The engine’s bottom end is particularly stout, often handling significant mileage without major internal issues when cared for correctly.

Common VQ37VHR Strengths

• Timing Chain System: The VQ37VHR uses a timing chain, which is designed to last the life of the engine, unlike timing belts that require periodic replacement. This reduces a significant maintenance item.
• Strong Bottom End: The engine block and rotating assembly are well-engineered, providing a solid foundation for performance and durability.
• Proven Design: The VQ series has been refined over decades across various Nissan and Infiniti models, benefiting from continuous development.

Known Weaknesses and What to Watch For

No vehicle is without its quirks, and the 370Z is no exception. Understanding these specific areas allows owners to be proactive and address potential issues before they become major problems. These aren’t universal failures, but they are common points of discussion among Z owners.

Addressing the Oil Gallery Gasket Issue

One of the most talked-about concerns, particularly for early production 370Z models (roughly 2009-2012), involves the oil gallery gaskets. These gaskets, located behind the timing cover, were originally made of a composite paper material. Over time, heat cycling and oil exposure could cause them to degrade, leading to a drop in oil pressure.

Symptoms of failing oil gallery gaskets include a noticeable drop in oil pressure on the gauge, especially at idle, and sometimes a rattling sound from the timing chain area due to insufficient tensioner lubrication. Addressing this involves replacing the original paper gaskets with updated metal versions, a labor-intensive but effective repair. Nissan revised the gasket material in later production years, making this less of a concern for 2013+ models.

Other Common Wear Items

• Clutch Slave Cylinder (CSC): Manual transmission 370Zs are known for issues with the concentric slave cylinder. This component, located inside the bell housing, can fail, leading to a soft or non-existent clutch pedal. Aftermarket external slave cylinder kits are a popular upgrade to mitigate this recurring issue.
• Power Steering Hoses: Some owners report power steering fluid leaks, often from the high-pressure hose. Regular inspection of the power steering fluid level and hoses can help catch this early.
• Wheel Bearings: While not unique to the 370Z, wheel bearings can wear out, especially on cars driven hard or with higher mileage. A humming noise that changes with speed or cornering is a common indicator.
• HVAC Blower Motor Resistor: A minor but common electrical issue, this can cause the blower fan to only work on certain speeds or not at all. It’s a relatively inexpensive and straightforward repair.

Maintenance is Key for Z-Car Longevity

Like any performance vehicle, the 370Z thrives on consistent, quality maintenance. Skipping scheduled service intervals or using sub-par fluids can accelerate wear and lead to unexpected repairs. Think of it like keeping a finely tuned instrument in perfect pitch; it requires regular attention.

Using the correct viscosity engine oil, often a full synthetic, is essential for the VVEL system and overall engine health. Regular checks of all fluid levels—engine oil, coolant, brake fluid, power steering fluid, and differential fluid—are simple steps that yield big returns. For manual transmissions, periodic fluid changes are important, and for automatic transmissions, adhering to the manufacturer’s recommended service intervals helps preserve their function.

Essential Maintenance Schedule Highlights

Adhering to a consistent maintenance schedule helps keep a 370Z running strong. Here’s a general guide for key items:

Service Item	Interval (Miles)	Notes
Engine Oil & Filter	5,000 – 7,500	Use full synthetic oil; check level regularly.
Tire Rotation	5,000 – 7,500	Helps even out wear, though staggered setups limit rotation.
Brake Fluid Flush	30,000 or 2 years	Important for brake performance and component life.
Coolant Flush	60,000 or 5 years	Prevents corrosion and maintains cooling efficiency.
Spark Plugs	60,000 – 100,000	Depends on plug type and driving conditions.
Differential Fluid	30,000 – 60,000	Essential for limited-slip differential health.

Driving Habits and Modifications

How a 370Z is driven significantly impacts its long-term reliability. A car regularly subjected to track days or aggressive driving will naturally experience more wear and tear than one used for casual cruising. Components like brakes, tires, and suspension parts will have a shorter lifespan under strenuous conditions.

Modifications also play a role. Adding forced induction (turbochargers or superchargers) or making significant engine internal changes can push components beyond their factory design limits. Such modifications require careful tuning, upgraded supporting systems (fueling, cooling), and often, a willingness to accept a reduced lifespan for certain parts. Even seemingly minor modifications, like suspension changes, can affect alignment and tire wear if not done correctly.

What to Consider When Buying Used

When looking at a pre-owned 370Z, a thorough inspection is paramount. Many Zs have been enthusiast-owned, which can mean meticulous care or, conversely, heavy use and modifications. A pre-purchase inspection (PPI) by a reputable mechanic familiar with these cars is a wise investment. This can uncover potential issues like the oil gallery gasket problem, clutch wear, or signs of accident damage that might not be immediately obvious.

Service records are golden. A history of regular oil changes, fluid flushes, and addressing known issues demonstrates responsible ownership. Check for rust, especially in areas where road salt is common, paying attention to suspension components, brake lines, and the undercarriage. For a general idea of market value and common owner reviews, resources like Kelley Blue Book offer useful data points.

Used 370Z Pre-Purchase Inspection Checklist

A comprehensive inspection helps ensure you’re making a sound purchase:

Area to Inspect	Key Points to Check
Engine Bay	Oil gallery gasket repair proof (if applicable), fluid leaks, belt condition, battery health, any aftermarket modifications.
Undercarriage & Suspension	Rust, bent components, worn bushings, shock/strut leaks, exhaust condition.
Brakes & Tires	Rotor thickness, pad wear, tire tread depth, evenness of tire wear.
Transmission & Drivetrain	Smooth shifting (manual and auto), clutch feel, differential noise, CV boot condition.
Interior & Electronics	HVAC function, power windows, dashboard lights, seat condition, any warning lights.
Test Drive	Engine performance, steering feel, brake effectiveness, unusual noises, alignment.

Safety and Structural Integrity

The Nissan 370Z comes equipped with standard safety features designed to protect occupants. These include anti-lock brakes (ABS), electronic brakeforce distribution (EBD), brake assist, and Nissan’s Vehicle Dynamic Control (VDC) system, which helps maintain stability. A full complement of airbags, including front, side-impact, and side-curtain airbags, provides passive safety. According to the NHTSA, crash test ratings provide valuable insight into a vehicle’s protective capabilities.

The 370Z’s chassis is designed with rigidity in mind, which contributes to both handling and occupant protection. Its compact, two-seater layout places occupants within a strong safety cell. The car’s low center of gravity also contributes to its inherent stability.

Fuel Economy and Emissions

As a performance-oriented V6 sports car, the 370Z isn’t designed for maximum fuel efficiency. Its 3.7-liter engine, while powerful, does consume more fuel than smaller, more economy-focused engines. Fuel economy varies depending on the transmission (manual vs. automatic) and, significantly, on driving style. Aggressive driving, frequent hard acceleration, and high-speed cruising will naturally decrease mileage.

Emissions compliance is managed by the vehicle’s catalytic converters and engine management system. Regular maintenance, including spark plug replacement and air filter changes, helps the engine run efficiently and within emissions standards. Any issues with oxygen sensors or catalytic converters can trigger a check engine light and impact emissions test results.