2005 maintenance schedule
2005 Acura NSX Maintenance Schedule & Service Intervals
The 2005 Acura NSX represents the final model year of the first-generation NSX, powered by the legendary 3.2L V6 (C32B) engine producing 290 horsepower.
Last updated
May 30, 2026
Reviewed for service schedule clarity.
The 2005 Acura NSX represents the final model year of the first-generation NSX, powered by the legendary 3.2L V6 (C32B) engine producing 290 horsepower. As a high-performance exotic, its maintenance requirements are critical—particularly the timing belt, as the C32B is an interference engine where belt failure causes catastrophic and expensive engine damage .
> CRITICAL ENGINE NOTE: The NSX's C-series V6 uses a timing belt, not a chain. This is an interference engine. If the belt breaks while driving, the pistons will strike the valves—the engine will self-destruct. Replacement is mandatory .
Key Takeaways
- The NSX uses a timing belt (NOT a chain) on an interference engine. Replacement is required at 105,000 miles or 7 years, whichever comes first . If driven in extreme temperatures (under -20°F or over 110°F), replace every 60,000 miles .
- For a 2005 NSX, age is the critical factor. With the 7-year interval, the belt should have been replaced in 2012, 2019, and again in 2026. If the timing belt service history is unknown, replace it immediately regardless of mileage.
- The NSX uses a 3.2L engine with 6-speed manual or 4-speed automatic. The 2005 NSX-T featured a removable t-top roof . The C32B is unique to the NSX and parts are becoming increasingly rare.
- Service at an Acura dealer is NOT mandatory. Maintenance may be done by any qualified service facility or skilled person. Keep all receipts as proof of completion .
- For major periodic service, this should generally be done every 2 years or after 30,000 kilometers (approximately 18,600 miles) .
Engine & Drivetrain Specifications
The 2005 Acura NSX is the final iteration of Honda's hand-built supercar.
| Specification | Value |
|---|---|
| Engine | 3.2L V6 (C32B), DOHC VTEC |
| Horsepower | 290 hp |
| Torque | 224 lb-ft |
| Transmission | 6-speed manual (standard) or 4-speed automatic |
| Drivetrain | Rear-wheel drive (RWD) |
| Fuel requirement | Premium (91 octane or higher) |
| Engine oil type | SAE 5W-30 or 10W-30 (consult owner's manual for specific climate) |
| Engine type | Interference engine |
| Fuel tank capacity | 18.5 gallons (70 liters) |
| Curb weight | Approximately 3,100 lbs |
Engine Architecture: The C32B features titanium connecting rods, forged pistons, and a dual-stage intake manifold. It is hand-assembled by Honda's most experienced technicians, and replacement engines are exceptionally rare and expensive—$20,000+ from Acura, $10,000+ used . This makes proper maintenance critical.
Timing Belt Specifications:
- Compatible belt: Dayco 95231
- Manufacturer-rated interval: 105,000 miles
- Water pump driven by timing belt—replace simultaneously
Maintenance Minder System (2005 NSX)
The 2005 NSX predates Honda/Acura's modern Maintenance Minder system. However, general Acura maintenance codes apply as a reference guide .
Understanding the Codes
| Code | Service Required |
|---|---|
| A | Replace engine oil |
| B | Replace oil and oil filter; inspect brakes, suspension, steering, fluid levels, exhaust, and fuel systems |
| 1 | Rotate tires |
| 2 | Replace air cleaner element; inspect drive belt |
| 3 | Replace transmission fluid |
| 4 | Replace spark plugs; replace timing belt and inspect water pump; inspect valve clearance |
| 5 | Replace engine coolant |
Owner's Maintenance Checks (From the 2005 Manual)
The following checks must be performed regardless of mileage :
| Frequency | Check Item |
|---|---|
| Each fuel fill | Engine oil level |
| Each fuel fill | Engine coolant level (expansion tank) |
| Monthly | Brake fluid level |
| Monthly | Clutch fluid level (manual transmission) |
| Monthly | Tire pressure and tread condition |
| Monthly | Lights (headlights, parking lights, taillights, brake lights) |
Service at Independent Shops – Important
From the 2005 NSX Owner's Manual :
> *"Service at a dealer is not mandatory to keep your warranties in effect. Maintenance may be done by any qualified service facility or skilled person . Keep all the receipts as proof of completion, and have the person who does the work fill out the Maintenance Record."*
For major periodic service, this should generally be done every 2 years or after 30,000 kilometers (approximately 18,600 miles) .
Timing Belt – The Most Critical Service
The C32B engine requires timing belt replacement on a strict schedule. This is the single most important maintenance item for the 2005 NSX.
Factory Replacement Intervals
| Specification | Detail |
|---|---|
| Engine type | Interference engine—belt failure destroys the engine |
| Standard replacement | 105,000 miles or 84 months (7 years), whichever comes first |
| Severe condition interval | If regularly operated in ambient temperatures under -20°F or above 110°F: 60,000 miles |
| Manufacturer-rated belt | Dayco 95231 (105,000-mile rating) |
| Water pump | Replace with timing belt—driven by the timing belt |
Why the Timing Belt Is Critical
The C32B is an interference engine. If the timing belt breaks, the pistons will strike the open valves, resulting in bent valves, damaged pistons, and typically requiring complete engine replacement.
Replacement costs vs. engine replacement:
- Timing belt service: $2,000-$3,000 (or ~$1,000 if DIY)
- New C32B engine from Acura: $20,000+
- Used C32B engine: $10,000+
> *"A broken or loose timing belt can cause catastrophic engine damage , resulting in potentially needing a new engine . So, for me it's a math problem with an easy answer—change the belt."* — NSX owner community
The Age Factor – Critical for 2005 NSX Owners
For a 2005 NSX in 2025, the age factor is paramount. The 7-year interval means:
| Replacement Window | Year (based on 7-year interval) |
|---|---|
| First replacement | 2012 |
| Second replacement | 2019 |
| Third replacement | 2026 (due now) |
If the timing belt history is unknown, assume it is original and replace it immediately. One NSX owner reported their car with only 33,000 miles had the belt replaced at ~30,000 miles due to age concerns .
Timing Belt Replacement – The "Full Job"
When replacing the timing belt, NSX specialists recommend refreshing the engine while it's apart :
| Component | Recommendation |
|---|---|
| Timing belt | Replace (Dayco 95231) |
| Water pump | Replace (driven by timing belt) |
| Tensioner | Replace |
| Idler pulleys | Replace |
| Cam plugs | Replace (prevent oil leaks) |
| Valve cover gaskets | Replace |
| VTEC solenoid gasket | Replace |
| Oil pump seal | Replace |
| Drive belts | Replace (serpentine/accessory belts) |
| Coolant | Flush and replace |
| Spark plugs | Replace (with timing belt service) |
| Valve clearance | Inspect and adjust |
> *"Most owners also refresh the engine while it's all apart for the TB/WP service. It's a few hundred bucks' worth of O-rings and rubber seals, but it ensures everything is reset to zero once the engine goes back together. After all, it would really suck if you develop an issue because a $2 O-ring failed, that could have been changed during the service."* — NSX owner community
Engine Oil Change Guidance
Factory Recommendations
| Specification | Detail |
|---|---|
| Recommended oil | SAE 5W-30 or 10W-30 premium-grade detergent oil |
| Check frequency | Every time you fill the fuel tank |
| Change interval | Approximately every 7,500-10,000 miles or 12 months |
| Severe conditions | If tracking or driving aggressively, reduce interval to 3,000-5,000 miles |
How to Check Oil Level
- Park on level ground and wait at least 3 minutes after engine shutdown
- Pull out the dipstick (located on the driver's side of the engine bay)
- Wipe completely clean, reinsert fully, then remove again
- Oil level should be between the upper and lower marks
Owner Guidance
- Acura Genuine Motor Oil is recommended, though any quality synthetic of the same viscosity is acceptable
- The C32B is a high-performance engine that may consume oil under hard driving—monitor levels regularly
- For tracked NSXs, many owners use thicker viscosity (10W-30) for better protection at high temperatures
Transmission Service
6-Speed Manual Transmission
| Specification | Detail |
|---|---|
| Fluid type | Honda Manual Transmission Fluid (MTF) |
| Change interval | Every 30,000-60,000 miles |
| Capacity | Approximately 2.5 quarts |
| Check frequency | Monthly |
Owner Guidance: The NSX 6-speed manual is legendary for its precision. Use only Honda MTF for optimal shift feel. The clutch fluid shares the brake fluid reservoir and must be checked monthly .
4-Speed Automatic Transmission (if equipped)
| Specification | Detail |
|---|---|
| Fluid type | Honda ATF-Z1 (now ATF-DW1) |
| Change interval | Every 60,000 miles |
| Capacity | Approximately 6.5 quarts (dry) |
Spark Plug Replacement
| Specification | Detail |
|---|---|
| Replacement trigger | With timing belt service (Code 4) |
| Type | Iridium or platinum (OEM-specified NGK or Denso) |
| Quantity | 6 plugs |
| Reference interval | 105,000 miles |
Valve clearance should be inspected and adjusted at the same time .
Engine Coolant Service
| Specification | Detail |
|---|---|
| Replacement trigger | With timing belt service (Code 5) |
| Coolant type | Honda Long Life Antifreeze/Coolant Type 2 (blue, premixed 50/50) |
| Check frequency | Every fuel fill (expansion tank) |
Owner Guidance: Do not use generic green coolant. Honda Type 2 coolant is specifically formulated for aluminum engine components. The NSX's mid-engine layout makes the cooling system critical—maintain it meticulously.
Brake & Clutch Fluid Replacement
| Specification | Detail |
|---|---|
| Check frequency | Monthly |
| Replacement interval | Every 2-3 years |
| Specified fluid | Honda Heavy Duty Brake Fluid DOT 3 or DOT 4 |
| Clutch fluid | Manual transmission models share the brake reservoir—check both |
Owner Guidance: A complete system flush is required—topping off the reservoir is not sufficient. The NSX's braking system is critical for safety. Check the level monthly and keep between MIN and MAX marks .
Drive Belt & Air Filters
| Component | Replacement Trigger |
|---|---|
| Engine air cleaner element | Replace with Code 2; inspect regularly |
| Drive belt | Replace during timing belt service |
Owner Guidance: The NSX's engine air filter is accessible from the engine bay. A clogged filter reduces performance—replace it annually or more frequently in dusty conditions. The serpentine drive belt is replaced during timing belt service as it must be removed to access the timing belt.
Valve Clearance Inspection
| Specification | Detail |
|---|---|
| Inspection trigger | With timing belt service (Code 4) |
| Adjustment | Adjust if valves are noisy |
Owner Guidance: The C32B uses mechanical lifters (not hydraulic). Valve clearances should be checked every major service. Tight exhaust valves can lead to burned valves—this is especially important on a high-revving engine like the NSX.
Scheduled Maintenance Summary
Since the 2005 NSX predates the modern Maintenance Minder, the table below shows recommended reference intervals based on the 7-year/105,000-mile timing belt schedule :
| Component | Reference Interval | Notes |
|---|---|---|
| Engine oil & filter | Every 7,500-10,000 miles or 12 months | Check level every fuel fill |
| Timing belt & water pump | 105,000 miles or 7 years (60,000 miles severe) | Most critical service |
| Spark plugs | With timing belt service | NGK or Denso only |
| Valve clearance | With timing belt service | Adjust only if noisy |
| Engine coolant | With timing belt service | Honda Type 2 blue only |
| Drive belt | With timing belt service | Serpentine belt |
| Transmission fluid (manual) | Every 30,000-60,000 miles | Honda MTF only |
| Transmission fluid (auto) | Every 60,000 miles | Honda ATF-DW1 only |
| Brake fluid | Every 2-3 years | Check monthly |
| Clutch fluid (manual) | With brake fluid | Shares reservoir |
| Tire rotation | Every 7,500-10,000 miles | Check pressure monthly |
| Major periodic service | Every 2 years or 18,600 miles | General inspection |
Monthly Checks Summary
From the 2005 NSX Owner's Manual :
| Check | Frequency |
|---|---|
| Engine oil level | Each fuel fill |
| Engine coolant level (expansion tank) | Each fuel fill |
| Brake fluid level | Monthly |
| Clutch fluid level (manual) | Monthly |
| Tire pressure and tread | Monthly |
| Lights operation | Monthly |
NSX-Specific Long-Term Ownership Considerations
Find a Qualified NSX Specialist
The NSX is a low-volume exotic with unique engineering. According to NSX owner community :
> *"At this point in the NSX's life, most of the NSX-trained dealer techs are gone. There are a few left, but most owners these days go to an expert third-party shop. These shops usually have ex-dealer, factory-trained NSX mechanics or mechanics with a lot of experience on the NSX. It's usually a safer bet than the dealers, who have messed up a lot of NSXs in recent years ."*
The C32B is Rare and Expensive
A replacement C32B engine from Acura costs $20,000+ . Used engines often exceed $10,000 . This makes preventive maintenance—especially the timing belt—financially mandatory.
Age Affects More Than Just the Timing Belt
For a 2005 NSX in 2025:
| Component | Age Degradation |
|---|---|
| Timing belt | Rubber cracks; replace every 7 years |
| Coolant hoses | Rubber degrades; inspect all hoses |
| Vacuum lines | Become brittle; can cause idle issues |
| Suspension bushings | Rubber cracks; affects handling |
| Tires | Over 6 years old = replace regardless of tread |
| O-rings & seals | The TB/WP service is the time to replace these |
> *"Both rubber and nylon degrade with age and heat . That said, the belt is well engineered and there are plenty of NSXs out there driving on 20+ year old belts. My perspective is that a broken or loose timing belt can cause catastrophic engine damage , so for me it's a math problem with an easy answer—change the belt."* — NSX owner community
Maintenance questions
2005 Acura NSX FAQs
Does the 2005 Acura NSX have a timing belt or timing chain?+
It has a timing belt. The 3.2L V6 (C32B) uses a rubber timing belt. This is an interference engine—if the belt breaks, the engine will self-destruct .
When should the timing belt be replaced?+
At 105,000 miles or 7 years, whichever comes first . If driven in extreme temperatures (under -20°F or over 110°F), replace every 60,000 miles . For a 2005 NSX with unknown history, replace it immediately .
How often should I change the oil in my 2005 NSX?+
Check the engine oil level every time you fill the fuel tank . Change approximately every 7,500-10,000 miles or 12 months. Use SAE 5W-30 or 10W-30 premium-grade oil.
How much does timing belt replacement cost on an NSX?+
$2,000-$3,000 at a specialist (or ~$1,000 if DIY) . This is a bargain compared to a $20,000 replacement engine .
What fluids does the NSX use?+
- Engine oil: SAE 5W-30 or 10W-30
- Transmission (manual): Honda MTF
- Transmission (auto): Honda ATF-DW1
- Coolant: Honda Type 2 blue
- Brake/Clutch fluid: Honda DOT 3 or DOT 4
How often should I check the brake and clutch fluid?+
Monthly. The brake fluid level (and clutch fluid, which shares the reservoir on manual cars) should be checked every month .
How often should major periodic service be performed?+
For major periodic service, this should generally be done every 2 years or after 30,000 kilometers (approximately 18,600 miles) .
Can I take my NSX to an independent shop without voiding any warranty?+
Yes. Acura states that service at a dealer is not mandatory to keep your warranties in effect. Maintenance may be done by any qualified service facility or skilled person . However, ensure they have NSX experience.
How do I find a qualified NSX mechanic?+
Most factory-trained dealer techs have retired or moved to independent shops. NSX owners recommend finding a specialist shop with NSX experience rather than taking it to a general Acura dealer .
Why is the NSX timing belt replacement so expensive?+
The NSX is a mid-engine exotic. The timing belt requires dropping the engine or extensive disassembly to access. Labor times are significantly higher than front-engine vehicles .
Does the NSX have any maintenance items that are unique to mid-engine cars?+
Yes. The rear bank of the engine is difficult to access. Coolant bleeding requires special procedures. Tire rotation is impossible (staggered fitment). Many standard maintenance tasks require a lift and specialized knowledge.
What should be done during the timing belt service besides the belt?+
Replace the water pump, tensioner, idler pulleys, cam plugs, valve cover gaskets, VTEC solenoid gasket, oil pump seal, drive belts, coolant, and spark plugs. Perform valve clearance adjustment .
How often should I rotate the tires?+
Rotate tires at every oil change (approximately every 7,500-10,000 miles) . Check tire pressure monthly .
Where can I find the official 2005 Acura NSX Owner's Manual?+
The official 2005 Acura NSX Owner's Manual is available online through resources like ManualsLib and Manual.pe . The OEM manual is the authoritative source for all maintenance information.
How long can a 2005 NSX last with proper maintenance?+
With meticulous care—especially timely timing belt replacements—the C32B engine can exceed 200,000-300,000 miles. Many original NSXs remain on the road today with 150,000-200,000+ miles. However, age-related rubber degradation (hoses, belts, seals) requires constant attention; many high-mileage NSXs have had full engine-out refreshes with all rubber components replaced. The key is not deferring maintenance.