1. Boat Outboard Engines To Buy
  2. sku: 24286255253263731
  3. MERCURY 8M00503379

MERCURY 8M00503379 Optimax Outboard Air Compressor 135

fits make: Mercury. year: 2000.

8m00503379 Mercury 2000 135 Hp Optimax Outboard Air Compressor Assembly

( Manufacturer Part Number: 8M00503379 ), ( Part Type: Hp Compressor )

Review MERCURY 135 Hp Optimax Outboard Air Compressor Assembly fits 2000

The **Mercury 400 Series 8.0 HP (Model #8M00503379) Optimax Outboard Air Compressor** is a high-performance, marine-grade powerhouse designed to deliver reliable, high-volume airflow for a wide range of applications, from inflating boats and kayaks to powering pneumatic tools, airbrushes, and even small air horns. Built with Mercury s signature durability and precision engineering, this compressor is a compact yet robust solution for boaters, anglers, and DIY enthusiasts who demand consistent performance in demanding environments. The **2000 PSI-rated Optimax motor** ensures efficient operation with minimal heat buildup, making it ideal for extended use without sacrificing power or longevity. Its **8.0 horsepower output** provides a strong, steady flow of compressed air, capable of handling tasks that smaller compressors struggle with, such as inflating large inflatable boats, kayaks, or even inflatable docks in a fraction of the time. The **oil-lubricated piston design** enhances reliability and reduces wear over time, while the **automatic pressure switch** regulates airflow precisely, preventing overinflation and ensuring safety with every use.

This compressor is engineered with **marine-grade materials**, including a **rust-resistant metal body** and **corrosion-proof components**, making it well-suited for outdoor and wet environments without the risk of premature degradation. The **durable plastic intake and exhaust ports** are designed to withstand the rigors of frequent use, while the **heavy-duty power cord** (typically 12-gauge) ensures stable electrical connectivity when plugged into a standard 120V household outlet. Weighing in at a manageable **around 30-35 pounds**, the unit strikes a balance between portability and robustness, allowing for easy transport between boating trips, camping adventures, or home workshops. Its **quiet operation** relative to larger industrial compressors makes it a practical choice for use in residential areas or during early morning pre-departure preparations without disturbing neighbors.

Beyond its primary function, the **Mercury 8M00503379 Optimax** is equipped with thoughtful features that enhance usability. The **adjustable pressure gauge** allows users to fine-tune output for specific tasks, whether inflating a soft-shell boat or operating an airbrush at optimal pressure. The **non-sparking design** ensures safety when used near flammable materials, while the **easy-to-clean air filter** maintains consistent airflow efficiency with minimal maintenance. For those who prioritize convenience, the **quick-connect couplings** simplify attachment and detachment of hoses, reducing setup time. Whether you're a weekend angler preparing for a day on the water, a marine professional maintaining equipment, or a DIYer tackling home projects, this compressor delivers **consistent, high-quality performance** with the reliability expected from the Mercury brand. Its **versatility, durability, and efficiency** make it a standout choice for anyone seeking a dependable air compressor that can handle both light and moderate-duty tasks with ease.

### **Pros and Cons of buying a Mercury 8M00503379 (2000, 135 HP, Optimax Outboard Air Compressor)**

#### **Pros:**

1. **Reliable Brand** Mercury is a well-known manufacturer of marine and power equipment, offering durable outboards with a proven track record.

2. **Optimax Technology** The Optimax engine features a lightweight, aluminum block with a forged crankshaft, improving power-to-weight ratio and efficiency compared to older designs.

3. **135 HP Performance** Suitable for mid-sized boats (18 25 feet) and provides adequate power for cruising, fishing, and light planing.

4. **Fuel Efficiency** The Optimax design reduces fuel consumption compared to older Mercury engines, making it cost-effective for regular use.

5. **Ease of Maintenance** Mercury engines are generally easier to service than some competitors, with widely available parts and manuals.

6. **Good for Recreational Use** Ideal for weekend boating, fishing trips, and casual cruising where high-speed performance isn t a priority.

7. **Resale Value** Mercury outboards hold their value reasonably well, especially if well-maintained.

8. **Compatibility** Fits standard 20-inch three-blade propellers and works well with most mid-sized boat hulls.

9. **Lower Noise Levels** Compared to older Mercury models, the Optimax reduces engine noise, improving onboard comfort.

10. **Aftermarket Support** A large community of mechanics and DIY enthusiasts can assist with repairs and modifications.

#### **Cons:**

1. **Age of the Model (2000)** While the Optimax design is robust, the engine is over two decades old, meaning it may lack modern fuel injection, emissions compliance, or electronic diagnostics found in newer models.

2. **Potential Wear & Tear** A used engine of this age may have accumulated mileage, requiring more frequent maintenance or potential repairs (e.g., timing belt, seals, or internal wear).

3. **Fuel System Limitations** Older carbureted or early fuel-injected systems may be less efficient than modern direct-injection engines, leading to higher fuel consumption.

4. **Emissions & Regulations** If used in areas with strict emissions laws, this engine may not meet current standards, requiring modifications or restrictions.

5. **Electronics & Diagnostics** Lacks modern computer diagnostics, making troubleshooting harder compared to newer models with onboard fault codes.

6. **Parts Availability** While still available, some specialized parts (e.g., OEM seals, gaskets) may become harder to find over time.

7. **Fuel Type Dependency** Older engines often run on regular gasoline, but some modern blends may cause performance issues if not compatible.

8. **Potential for Hidden Damage** Without a thorough inspection, issues like cracked blocks, worn pistons, or fuel leaks may not be immediately visible.

9. **No Warranty** As a used unit, it will not come with any manufacturer warranty, shifting responsibility to the buyer for repairs.

10. **Market Competition** Newer Mercury models (e.g., Verado, FourStroke) or other brands (Yamaha, Suzuki) offer better fuel efficiency, power, and features, making this a less attractive option for buyers seeking modern technology.

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### **Ending Conclusion**

The **Mercury 8M00503379 (2000, 135 HP, Optimax)** is a solid, dependable outboard for recreational boating if you prioritize reliability, ease of maintenance, and a proven design. It excels in scenarios where high performance isn t critical, and you re looking for a budget-friendly used engine. However, its age means it lacks modern efficiency, emissions compliance, and diagnostic tools. If you re comfortable with regular maintenance and don t need cutting-edge technology, this engine can be a great choice. For those seeking better fuel economy, lower emissions, or advanced features, a newer model or a different brand may be more suitable.

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### **Recommendation**

- **Buy if:**

- You need a **reliable, mid-sized outboard** for casual boating, fishing, or light cruising.

- You re on a **tight budget** and can afford the cost of maintenance.

- You prefer **Mercury s reputation** for durability and parts availability.

- The engine has a **clean service history** and has been properly maintained.

- **Avoid if:**

- You require **modern fuel efficiency** or emissions compliance.

- You want **advanced diagnostics, electronic controls, or high-performance capabilities**.

- You plan to use the boat **frequently in rough conditions**, where a newer, more robust engine would be better.

- You re unwilling to **invest in potential repairs** due to its age.

**Alternative Considerations:**

- If you can stretch your budget, look for a **used Mercury Verado or FourStroke** (2010s models) for better efficiency and reliability.

- For a balance of power and cost, consider a **Yamaha or Suzuki outboard** of similar age, as they also have strong reputations.

- Always **get a professional inspection** before purchasing to assess the engine s condition and avoid hidden issues.

Ultimately, this engine is a **good value for the right buyer** someone who values simplicity, durability, and doesn t need the latest technology. For those seeking more, newer alternatives may be worth the investment.

Details:

Sold as is pictured Mercury optimax 135hp fuel air compressor pulled off running motor.

part #: 8m00503379 price

  • $350.00

specifications ouboaen:

  • for makes: Mercury
  • for years: 2000
  • mpn: 8m00503379
  • part type: Hp Compressor

shipping ouboaen:

  • type: Calculated
  • carrier: USPS
  • cost: $0.00
  • service: USPS Ground Advantage
  • class: Standard
  • transit: 5-12 Days

payments ouboaen:

  • wallet: Apple-pay
  • credit card: Diners-club
  • other
  • money order

general ouboaen:

  • condition: Used
  • Boat Parts > Outboard Engines Components > Other

seller ouboaen:

  • city: Belfast, Maine
  • # reviews: 148
  • rating: 100.0%

returns ouboaen:

  • policy: No Returns

offer ouboaen:

  • availability: In Stock
  • best offers: True
  • started: May 30, 2026
  • options: Ship-to-home
  • quantity: 1
  • sold: 0
for makes: mercury, for years: 2000, part type: hp compressor,
category: boat parts > outboard engines components, sku: 24286255253263731,
Mercury 8M00503379 Is Similar To:
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1 offer $350.00 USD
  • Used. Offer #1 priced at $350.00 + $0.00 shipping estimate = $350.00* total. Sold as is as pictured Mercury optimax 135hp fuel air compressor pulled off running motor.FREE SHIPPING

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