NISSAN 12100-31U04 Connecting Rod 3.0L 12100-31U0B

( Brand: Nissan ), ( Manufacturer Part Number: 12100-31U04 ), ( Rod Bearing Size: Std ), ( Custom Bundle: No ), ( Fitment Type: Direct Replacement ), ( Bore Size: Standard ), ( Type: Connecting Rod ), ( Manufacturer Warranty: 3 Months ), ( Surface Finish: Clean ), ( Item Weight: 2 Lb )

Review NISSAN Connecting Rod Infiniti 3.0l Oe fits MAXIMA I30 I35 1996–2002

The **Nissan 12100-31U04 Connecting Rod** is a precision-engineered, high-performance component designed exclusively for the **Infiniti I30, I35, and Maxima (3.0L V6) models produced between 1996 and 2002**, as well as select Nissan applications featuring the **VR30DE engine**. Crafted from **forged 4140 steel**, this connecting rod is built to withstand the extreme stresses of high-performance driving, ensuring durability, reliability, and optimal power transfer within the engine s crankshaft assembly. The rod features a **fully machined, heat-treated design** with a **smooth, polished surface finish**, minimizing friction and wear while maintaining structural integrity under heavy loads. Its **precision-ground small end** is designed to fit seamlessly with the **12100-31U0B piston pin**, ensuring proper alignment and reducing lateral play, which is critical for maintaining engine efficiency and longevity. The **large end** is engineered to accommodate the **Nissan 12100-31U04 bearing cap**, providing a secure, interference-fit connection that resists loosening under high RPM or aggressive driving conditions. Whether replacing a worn rod due to fatigue, engine modification, or performance tuning, this aftermarket rod delivers **OEM-level quality** with enhanced strength and precision, making it an ideal choice for both restoration projects and high-mileage engines. Built to strict manufacturing tolerances, it ensures a **snug, interference-fit installation**, reducing the risk of rod bolt stretch or failure common issues in aging engines. For enthusiasts seeking to restore stock performance or push their Infiniti s power output, this connecting rod offers a **cost-effective, high-quality upgrade** that maintains the engine s original specifications while improving reliability. Proper installation with the correct **rod bolts (12100-31U04 or equivalent)** and torque specifications is essential to maximize performance and prevent premature failure.

### **Pros and Cons of Buying a Nissan 12100-31U04 Connecting Rod (and 12100-31U0B Alternative) for 1996 2002 Infiniti I30, I35, Maxima 3.0L Engines**

#### **Pros of buying a 12100-31U04 Connecting Rod**

1. **Direct OEM Fitment** This part is the original equipment (OEM) connecting rod for the VQ30DE engine, meaning it will fit perfectly without modifications. It ensures proper alignment and performance.

2. **Proven Reliability** Nissan s original components are designed to meet strict durability standards, reducing the risk of premature failure compared to aftermarket knockoffs.

3. **Easier Rebuilding** Since it s the genuine part, rebuilders and mechanics familiar with VQ30 engines will have no issues installing it, reducing potential errors during assembly.

4. **Compatibility with Stock Specs** The rod matches the factory specifications for torque, balance, and clearance, which is critical for engine longevity and power output.

5. **Warranty Coverage (If Purchased from Nissan or Authorized Dealer)** Some OEM parts come with limited warranties, providing peace of mind against defects.

6. **Better Heat Dissipation** The original rod is forged from high-quality steel, which handles thermal stress better than some aftermarket alternatives that may use thinner or weaker materials.

7. **No Risk of Voiding Warranty (If Engine is Still Under Warranty)** If the engine is still under Nissan s original warranty, using an OEM part ensures compliance, whereas aftermarket parts might void coverage.

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#### **Cons of buying a 12100-31U04 Connecting Rod**

1. **Higher Cost** OEM parts are significantly more expensive than aftermarket alternatives. The 12100-31U04 can cost **$150 $300 **, depending on the source, whereas aftermarket rods may range from **$50 $120**.

2. **Longer Lead Times** OEM parts, especially older Nissan components, may take weeks to arrive from the manufacturer or distributor, delaying engine rebuilds.

3. **Potential for Counterfeit Parts** Buying from untrusted sellers (e.g., eBay, random online marketplaces) increases the risk of receiving a fake or low-quality part that could fail prematurely.

4. **Overkill for Minor Repairs** If the engine only requires a single rod replacement (e.g., due to a cracked rod from a misfire), an OEM rod may be excessive unless the rest of the engine is being rebuilt.

5. **Weight Consideration** While not a major issue, OEM rods are slightly heavier than some aftermarket forged rods, which could have a negligible impact on high-performance builds.

---

#### **Pros of Considering the 12100-31U0B (Alternative Rod)**

The **12100-31U0B** is a slightly older part number (used in some early VQ30DE applications) and may be cheaper or more available in some cases. However, its pros and cons overlap with the 12100-31U04:

- Still an OEM part, ensuring fitment and reliability.

- May be easier to source at a lower price if the 12100-31U04 is backordered.

- Less common, so verification of compatibility is required (some engines may require the 12100-31U04).

- No significant performance or durability advantage over the 12100-31U04.

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### **Key Considerations Before Purchase**

1. **Verify Engine Model and Year** Confirm whether your VQ30DE engine (I30, I35, or Maxima) requires the **12100-31U04** or if the **12100-31U0B** is compatible. Some early 1996 1997 models may use the 12100-31U0B, while later ones use the 12100-31U04.

2. **Source Reputation** Purchase from **Nissan dealerships, authorized parts distributors (e.g., RockAuto, JEGS), or trusted online retailers** to avoid counterfeit parts.

3. **Budget vs. Need** If the engine is being fully rebuilt, the OEM rod is justified. If only one rod is failing, weigh the cost against aftermarket options (e.g., **Fel-Pro, Crane, or Scat rods**), which are often just as strong.

4. **Aftermarket Alternatives** High-quality aftermarket rods (e.g., **Crane C110H, Scat 6620, or JE Aftermarket**) can be **50 70% cheaper** while maintaining durability. Some are even **forged for better strength** than the OEM part.

5. **Rebuilder s Expertise** If the engine is being rebuilt by a professional, ask whether they recommend OEM or aftermarket rods based on their experience with VQ30DE engines.

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### **Final Recommendation**

**Buy the 12100-31U04 OEM connecting rod** from a reputable source. It s the safest choice for a full engine rebuild, especially if the engine is still under warranty or you plan to keep it long-term.

**Consider a high-quality aftermarket rod (e.g., Crane C110H or Scat 6620)**. These parts are **forged, properly balanced, and often stronger** than the OEM rod, with a significantly lower price. Many rebuilders trust them for performance builds.

**Aftermarket rods are the better value**, unless you have a specific reason to use OEM (e.g., warranty concerns).

- **Avoid cheap or unknown aftermarket rods** Some budget rods may not be properly heat-treated or balanced, leading to premature failure. Stick to well-reviewed brands.

---

### **Conclusion**

The **12100-31U04 OEM connecting rod** is the most reliable choice for a VQ30DE engine rebuild, offering perfect fitment and Nissan s quality assurance. However, **aftermarket forged rods from reputable brands can be a cost-effective alternative** without sacrificing durability. Always verify compatibility, source parts from trusted sellers, and consider the engine s overall condition before deciding. For most owners, **a high-quality aftermarket rod is the best balance of cost and performance**, while OEM remains ideal for those prioritizing absolute reliability.

Details:

Nissan Maxima 1996 - 2002 3.0L. Infiniti I30 1997 -20013.0L. This is a Used Genuine Connecting Rod For The Infiniti I30 / I35 Nissan Maxima With 3.0L Engine Through Years 1996 - 2002. Discount prices on quality New Reconditioned Automotive Replacement Part.

Infiniti I35 2002 3.0L.

part #: 1210031u04 prices

• $28.95-$255.22

specifications pistonrinro:

• for models: I30, I35, Maxima
• for makes: Infiniti, Nissan
• for years: 1996-2002
• brand: Nissan
• mpn: 12100-31u04
• rod bearing size: Std
• custom bundle: No
• fitment type: Direct Replacement
• bore size: Standard
• type: Connecting Rod
• manufacturer warranty: 3 Months
• surface finish: Clean
• item weight: 2 Lb

offer pistonrinro:

• quantity: 10
• sold: 0
• options: Ship-to-home
• started: February 17, 2026
• availability: In Stock

seller pistonrinro:

• # reviews: 17925
• city: Dallas, Texas
• rating: 99.5%

returns pistonrinro:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

general pistonrinro:

• Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts
• condition: Used

payments pistonrinro:

• credit card: Mastercard
• other
• wallet: Google-pay

shipping pistonrinro:

• transit: 3-8 Days
• type: Fixed
• cost: $0.00
• service: USPS Ground Advantage
• class: Standard
• carrier: USPS

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