GM Insulator 25771771. 2000

( Brand: Gm ), ( Manufacturer Part Number: 25771771 ), ( Part Type: Insulator ), ( Year: 2000 2001 2002 2003 2004 2005 ), ( Parts Included: Only Part Reference 23 On The Diagram Is Included ), ( Fitment Type: Direct Replacement ), ( Genuine Oem: Yes ), ( Replaces Part Number: 25655600, 25716149 )

Review GM Genuine Insulator Oem Buick fits LESABRE 2000–2005

The **GM 25771771 Insulator** is a high-quality, factory-original component designed specifically for the **2000 2005 Buick LeSabre**, ensuring optimal performance and reliability for your vehicle s exhaust system. This insulator serves as a crucial thermal barrier between the exhaust manifold and the surrounding engine bay, preventing excessive heat transfer that could damage adjacent components, such as wiring harnesses, fuel lines, or body panels. Crafted from durable, heat-resistant materials, this insulator maintains its structural integrity under extreme operating temperatures, reducing the risk of warping, cracking, or premature failure. Its precise fitment ensures a secure attachment to the exhaust manifold and surrounding engine mounts, minimizing heat leakage while allowing for proper exhaust flow. Ideal for both original equipment replacement and aftermarket upgrades, this insulator helps preserve the longevity of your engine bay components and contributes to a cleaner, more efficient exhaust system. Whether you're restoring a classic LeSabre or maintaining a well-used model, this GM-approved part guarantees a seamless integration with your vehicle s exhaust architecture, delivering both performance and peace of mind.

### **Pros and Cons of Buying a GM 25771771 Insulator (2000-2005 Buick LeSabre)**

1. **Reliability of the Base Engine** The 2000-2005 Buick LeSabre typically came with a **3.8L V6 (L36)** or **3.1L V6 (L31)**, both of which are known for durability if maintained properly. The L36, in particular, is a robust engine when kept well-tuned.

2. **Comfortable Ride and Spacious Interior** The LeSabre was designed for comfort, with a smooth ride, ample legroom, and a well-appointed cabin. The seats are often in good condition in used examples.

3. **Decent Fuel Economy for a V6** Compared to larger V8 engines, the V6 models offer better fuel efficiency, averaging around **16-18 MPG city / 24-26 MPG highway** (varies by model year and transmission).

4. **Available Automatic Transmissions** Most LeSabres from this era came with a **4-speed automatic (4L60 or 4L65)**, which is a proven, durable transmission if not abused.

5. **Classic Buick Styling** The LeSabre had a distinctive, upscale appearance that remains appealing to some buyers, especially those who prefer a traditional full-size sedan.

6. **Potential for Modifications** The L36 engine is a popular choice for performance tuning, allowing for upgrades like intake manifolds, headers, and even forced induction if the engine is in good shape.

7. **Parts Availability** As a GM product from the early 2000s, parts (especially for the L36 engine and common components) are still relatively accessible, though some specialty items may require sourcing from used or aftermarket suppliers.

---

1. **Potential Electrical Issues** Early 2000s GM vehicles, including the LeSabre, are notorious for **electrical gremlins**, such as faulty sensors, wiring harness problems, or intermittent issues with the computer system. The **insulator (GM 25771771)** itself is a **coil-on-plug ignition coil** for the L36 engine, and these can fail prematurely, leading to misfires and poor performance.

2. **Rust Concerns** Many LeSabres from this era, especially those driven in snowy or salted regions, suffer from **frame and subframe rust**. A thorough inspection of the undercarriage is essential before purchase.

3. **Transmission Problems** While the 4-speed automatics are generally reliable, some LeSabres experience **rough shifting, delayed engagement, or solenoid failures** over time. A pre-purchase inspection should include a transmission fluid check and test drive to assess shifting smoothness.

4. **High Maintenance Costs Over Time** As the vehicle ages, **timing chain stretch, water pump failure, and serpentine belt issues** become more common. The L36 is generally forgiving, but neglect can lead to expensive repairs.

5. **Infotainment and Modern Tech Limitations** The LeSabre lacks modern features like Bluetooth, USB ports, or advanced driver aids. If you prioritize connectivity, you may need to add aftermarket solutions.

6. **Safety Ratings** The 2000-2005 LeSabre does not meet modern safety standards. It lacks **stability control, side airbags (on some models), and advanced crash protection**, which could be a concern for safety-conscious buyers.

7. **Depreciation and Resale Value** Full-size sedans like the LeSabre have seen declining demand, and resale value is not strong. If you plan to sell later, you may not recover much of your investment.

8. **Potential for Hidden Engine Issues** The **L36 engine** is prone to **oil leaks (valve cover gasket, oil pan gasket), timing chain stretch, and head gasket failure** if the vehicle was not maintained properly. A **compression test and leak-down test** are recommended before buying.

---

- Values **comfort, space, and classic styling** over modern tech.

- Plans to **drive it lightly** and perform **regular maintenance** (oil changes, timing chain inspection, electrical system checks).

- Is willing to **budget for potential electrical or transmission issues**.

- Prefers a **V6 engine** over a V8 but doesn t mind its limitations.

- Need **modern safety features** or advanced infotainment.

- Want a **low-maintenance, long-term reliable** vehicle without significant upkeep costs.

- Are sensitive to **electrical gremlins** or **rust-related structural concerns**.

- Plan to **keep the car for 10 years** without major repairs.

---

1. **Get a Pre-Purchase Inspection (PPI)** A mechanic should check for **engine compression, timing chain condition, electrical system health, and rust damage**.

2. **Verify Maintenance Records** Ensure the **oil changes were done regularly** (every 5,000 miles) and the **timing chain was inspected/replaced if needed**.

3. **Test Drive Thoroughly** Listen for **misfires (coil issues), rough shifting, or unusual noises** under acceleration/deceleration.

4. **Budget for Potential Repairs** Allocate funds for **electrical fixes, transmission fluid changes, and possible timing chain replacement** if the vehicle has high mileage.

5. **Consider a Lower-Mileage Example** If possible, aim for **under 120,000 miles** with **documented maintenance** to reduce long-term risks.

The **2000-2005 Buick LeSabre with the L36 engine can be a solid used car purchase if you re prepared for its quirks and willing to invest in maintenance.** However, it is **not a "set-and-forget" vehicle** and requires more attention than a modern, well-built compact sedan. If you prioritize **reliability and low ownership costs**, consider alternatives like a **Toyota Camry, Honda Accord, or Nissan Maxima** from the same era. If you re drawn to the **classic Buick experience and don t mind some extra upkeep**, the LeSabre can be a fun and comfortable daily driver.

Details:

The Genuine GM Insulator 25771771 is a high-quality, direct replacement part for specific Buick, Pontiac, and Oldsmobile model's from 2000 - 2005. This OEM part is guaranteed with a 1-year warranty and genuine GM product, ensuring perfect fit reliable performance.

part #: 25771771 prices

• $29.99-$42.89

specifications interiocatruc:

• for models: Lesabre
• for makes: Buick
• for years: 2000-2005
• brand: Gm
• mpn: 25771771
• part type: Insulator
• year: 2000 2001 2002 2003 2004 2005
• parts included: Only Part Reference 23 On The Diagram Is Included
• fitment type: Direct Replacement
• genuine oem: Yes
• replaces part number: 25655600, 25716149

seller interiocatruc:

• rating: 99.6%
• # reviews: 584
• city: Tucson, Arizona

general interiocatruc:

• Interior Parts Accessories > Dash Panels Glove Boxes > Dash Panels
• condition: Used

shipping interiocatruc:

• carrier: USPS
• service: USPS Ground Advantage
• transit: 5-8 Days
• type: Fixed
• class: Standard
• cost: $19.99

offer interiocatruc:

• quantity: 1
• sold: 0
• availability: In Stock
• started: May 16, 2026
• options: Ship-to-home

returns interiocatruc:

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

payments interiocatruc:

• wallet: Paypal
• other
• credit card: Diners-club

Gm 25771771 Is Similar To:

• 15762536 Matsushita Gm Gmc Suburban Tahoe Yukon Oem Factory Amplifier Amp (25.4% similar) Shipping cost is to the lower 48STATES only. Serious buyers only. Box e multi list. Parts are sold used...(June 24th, 2018)
• 01999355 Gmc Gm Cadillac Saab Chevrolet Rear Entertainment Dvd Remote Oem (18.4% similar) In excellent working condition. Overall good condition...(December 22nd, 2018)
• 09373344 Gm 95-02 Buick Century (30.3% similar) Used monsoon CD cassette radio out of a 2000 buick regal...(April 22nd, 2017)
• 09390673 Gm Oem Knobs Set Of Control (19.2% similar) What you see in the photos is will receive make sure to check all as they are part of. I ship to shipping hub only...(August 22nd, 2018)
• 15906573u 86271-70v850 100 Factory Oem Dvd Rom Navi Disk Discs 03 04 05 2006 Gm Cadillac Escalade Esv Ext Sport Awd Navigation Map Disc Cd (26.2% similar) Item is guaranteed to be as described. Please research your car's navigation system to ensure the proper purchase of your software it's comparability with your car. Part 15105609VERSION part 10390370VERSION. Navigation discs are considered software. DVD will work only with Cadillac Cadillac Escalade...(December 20th, 2015)
• 10193737 Gm Chevrolet Oem Corvette Trim Left (26.8% similar) ...(January 26th, 2019)
• 10200445 Gm Pontiac Fiero Nos Oem Parking Brake Cable New (27.2% similar) Thanks and happy buying. See images for exact item and condition...(July 3rd, 2018)
• 10296562 Gm Pontiac Oem Grand Speaker Audio Right (18.8% similar) ...(September 23rd, 2018)
• 10317990 Gm Chevy Impala Malibu Cavalier Radio Cd Player Oem (21.9% similar) This is a used part. Has scratches, scuffs, and marks. This is an am FM radio CD player from a 2003 Chevy cavalier. Part is as shown...(June 15th, 2018)
• 10333580 Gm 04 05 Buick (28.6% similar) Mistakes happen. Reason is each vehicle varies based on sound system, plugs, and lighting. All functions are in excellent working condition unless noted above. This includes all functions the radio has. Type: radio CD player part model face plate id N/A display color: blue does it have an amp. No, ...(October 20th, 2017)
• 10336840 General Motors Buick Lacrosse Gm Liner Free Shipping With Tracking (29.4% similar) Used insert piece...(July 2nd, 2018)