Billet Aluminum Engine Oil Filler Cap

Features:

• Fits 2017-2025 GM 2500HD and 3500HD trucks
• Compatible with 6.6L and 3.0L Duramax engines
• Replaces 6.6L OEM part #12677347
• Replaces 3.0L OEM part #55510927
• CNC machined from billet aluminum
• Black anodized for corrosion resistance
• OEM-style cam-lock for a secure fit
• Includes high-temp Viton O-ring seal
• Prevents oil cap blow-off under pressure
• Easy grip design for tight engine spaces
• Fits both OEM and aftermarket filler necks

Clean Up Your Engine Bay With Confidence

If you’re looking for a small upgrade that makes a big difference under the hood, the PPE Billet Aluminum Engine Oil Filler Cap is a solid choice. Designed to fit 2017-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L/3.0L Duramax diesel engine trucks, this cap offers a sleek and functional upgrade from the stock plastic version. It’s built from CNC-machined billet aluminum, finished in black anodizing, and styled to give your engine bay a cleaner, more refined look. But it’s not just for show, this cap also helps eliminate the risk of oil blow-off thanks to a tight cam-lock fit and high-temp Viton O-ring seal. It’s easy to grip, even in tight spots, while removing or installing without frustration. Whether you’re dressing up your build for a show or just replacing a worn-out stock cap, this is one of those subtle upgrades that you’ll appreciate every time you pop the hood. It's simple, smart, and built to last.

Built For Precise Fitment And Long Term Durability

The PPE 114003017 Billet Aluminum Engine Oil Filler Cap is engineered for performance, durability, and a factory-quality seal. This cap is a direct replacement for OEM part #12677347 on 6.6L Duramax engines and #55510927 on 3.0L Duramax engines, covering Silverado and Sierra HD models from 2017 through 2025. Constructed from CNC-machined billet aluminum, the cap offers increased strength over plastic designs and features a corrosion-resistant black anodized finish for long-term use in harsh engine bay environments. The integrated OEM-style cam-lock ensures a snug, secure fit, preventing vibration-related loosening or oil leakage. It also includes a Viton O-ring that delivers superior heat and chemical resistance, ensuring a reliable seal even during extended towing or heavy-duty use. Designed to work with both OEM and aftermarket filler necks, this cap installs quickly without any modification. It’s a purpose-built solution that blends premium materials with everyday functionality.

Fitment: 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GM Silverado/Sierra 2500HD/3500HD 6.6L/3.0L Duramax

Notes:

• Designed to fit 2017-2025 GM Silverado and Sierra 2500HD/3500HD
• Compatible with both 6.6L Duramax and 3.0L Duramax engines
• Replaces OEM part #12677347 (6.6L) and #55510927 (3.0L)
• Works with both OEM and aftermarket oil filler necks
  
• Check your existing cap part number for exact match