GM 12687168 Crankcase Ventilation Pcv Oil Separator

( Brand: Gm ), ( Manufacturer Part Number: 12687168 ), ( Part Type: Oil ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Parts Included: Only Part Reference 10 On The Diagram Is Included ), ( Replaces Part Number: 12672595 )

Review GM Genuine Positive Crankcase Ventilation Pcv Oil Separator

The **GM 12687168 Crankcase Ventilation PCV Oil Separator** is a critical yet often overlooked component in modern internal combustion engines, designed to maintain optimal performance, longevity, and emissions compliance while minimizing oil consumption and exhaust system contamination. This high-quality, direct-fit replacement part is engineered specifically for General Motors applications, ensuring seamless integration with the vehicle s engine management system. The PCV (Positive Crankcase Ventilation) oil separator serves as the engine s respiratory system, channeling harmful crankcase gases generated by combustion byproducts, blow-by, and oil vapor through a controlled pathway to the intake manifold, where they are safely reintroduced into the combustion chamber for reprocessing. Unlike basic PCV valves that rely solely on a one-way flow mechanism, this advanced oil separator incorporates a sophisticated filtration system that effectively traps and separates oil droplets and particulate matter from the exhaust gases, preventing them from fouling the engine s air intake, throttle body, or catalytic converter. Constructed from durable materials, including reinforced rubber grommets, precision-machined metal components, and a robust housing, this separator is built to withstand the high temperatures, pressures, and vibrations inherent in high-performance and heavy-duty applications. Its compact yet efficient design ensures minimal restriction to airflow while maximizing separation efficiency, reducing the risk of oil leaks, carbon buildup, and premature wear on critical engine components. Whether installed in a high-mileage vehicle experiencing increased blow-by or as part of a routine maintenance upgrade, this GM-specific PCV oil separator helps maintain peak engine efficiency, reduces harmful emissions, and extends the life of the engine s internal systems. Proper installation and periodic inspection are recommended to ensure continued optimal performance and compliance with emissions standards.

### **Pros and Cons of buying a GM 12687168 Crankcase Ventilation (PCV) Oil Separator**

1. **Direct OEM Fitment** This part is manufactured by GM and is designed specifically for certain GM engines, ensuring a proper fit without modifications. This reduces the risk of leaks or improper function compared to aftermarket alternatives.

2. **Improved Engine Efficiency** A properly functioning PCV system helps regulate crankcase pressure, reducing blow-by (oil vapors escaping into the combustion chamber) and improving engine performance. This can lead to better fuel economy and smoother operation.

3. **Prevents Oil Contamination** The oil separator component filters out oil particles from the crankcase vapors before they enter the intake system, preventing oil dilution in the combustion chamber and reducing carbon buildup on intake valves.

4. **Compliance with Emissions Standards** A well-functioning PCV system helps meet emissions regulations by ensuring proper crankcase ventilation without excessive oil carryover into the exhaust system.

5. **Cost-Effective Replacement** Compared to full engine rebuilds or more extensive repairs caused by a failing PCV system, replacing this component is relatively inexpensive and straightforward.

6. **Easy Installation** Since it is an OEM part, it is designed to fit seamlessly into the existing system, often requiring only basic tools for replacement.

7. **Extends Engine Life** By maintaining proper crankcase pressure and preventing oil loss, this part helps reduce wear on seals, gaskets, and other engine components.

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1. **Limited Compatibility** This specific part (GM 12687168) is designed for certain GM engines (likely small-block V8s or other models from the 1980s 2000s). Purchasing it for the wrong engine model may result in a non-functional or improper fit.

2. **Potential for Counterfeit Parts** Like many OEM components, there is a risk of purchasing a counterfeit or low-quality replica, which may fail prematurely or not function correctly. Buying from authorized dealers or reputable suppliers helps mitigate this risk.

3. **Aging Stock Availability** Older GM parts, especially those for discontinued models, may be harder to find in stock. You may need to order from specialty suppliers or wait for delivery.

4. **Mismatched Specifications** If the engine has been modified (e.g., turbocharged, supercharged, or tuned), the stock PCV system may not perform optimally under increased stress. In such cases, an upgraded or aftermarket PCV system might be necessary.

5. **Labor Costs if Professional Installation is Needed** While the part itself is inexpensive, if you lack mechanical experience, hiring a mechanic to install it may add to the overall cost.

6. **Potential for Other Underlying Issues** If the PCV system failure is symptomatic of a larger problem (e.g., worn piston rings, valve seals, or a failing crankshaft seal), replacing just the PCV separator may provide temporary relief but not a permanent fix.

7. **Environmental Concerns (Indirectly)** While not a direct con of the part itself, improper disposal of old PCV systems (if not recycled) could pose minor environmental concerns, though this is rarely an issue for individual consumers.

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The GM 12687168 PCV oil separator is a **highly recommended replacement part for its intended applications**. Its OEM quality ensures reliability, proper fitment, and compliance with engine requirements. The benefits such as improved engine efficiency, reduced oil contamination, and extended engine life outweigh the minor drawbacks, particularly if the part is purchased from a trusted source and installed correctly.

However, it is **critical to verify compatibility** with your specific engine model before purchasing. If the engine has been heavily modified or is part of a larger maintenance issue, consulting a mechanic may be advisable to ensure a comprehensive solution.

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- **Buy from an authorized GM parts dealer, a reputable auto parts store (e.g., RockAuto, 1A Auto, or local GM service centers)** to ensure authenticity and quality.

- **Confirm the exact engine model and year** to guarantee the part matches your vehicle s specifications.

- **Inspect the part upon arrival** for damage or defects, and check for proper packaging.

- **Follow the manufacturer s installation guidelines** carefully, or have a professional mechanic perform the replacement if unsure.

- **Monitor engine performance post-installation** to ensure the PCV system is functioning as intended.

For most standard applications, this is a **wise and cost-effective investment** in maintaining engine health.

Details:

Call Us at #214 342 4724. 6.6L diesel, upper components. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

part #: 12687168 prices

• $75.00-$142.18

specifications emissyste:

• brand: Gm
• mpn: 12687168
• part type: Oil
• genuine oem: Yes
• manufacturer warranty: 1 Year
• universal fitment: Direct Replacement
• parts included: Only Part Reference 10 On The Diagram Is Included
• replaces part number: 12672595

shipping emissyste:

• class: Standard
• service: Standard
• cost: $25.62
• type: Fixed
• transit: 4-7 Days

seller emissyste:

• # reviews: 7450
• city: Dallas, Texas
• rating: 99.6%

payments emissyste:

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

offer emissyste:

• started: March 21, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1

general emissyste:

• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts
• condition: New

returns emissyste:

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

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