Product Description
Stop oil creep past the guides on your LB7/LLY/LBZ/LMM with the MAHLE B45974 Valve Stem Oil Seal for 2001–2010 GM 6.6L Duramax. Built to OE standards with a metal shell and molded elastomer lip, this seal maintains tight control at high temp and high rpm to cut oil consumption and keep the combustion chambers clean.
Fitment
- 2001–2004 Chevrolet/GMC 6.6L Duramax LB7
- 2004.5–2005 Chevrolet/GMC 6.6L Duramax LLY
- 2006–2007 Chevrolet/GMC 6.6L Duramax LBZ
- 2007.5–2010 Chevrolet/GMC 6.6L Duramax LMM
- Platforms: Silverado/Sierra 2500HD & 3500HD (and related 6.6L applications)
Cross-Reference / Alternatives (Mahle only)
- Mahle GS33752 Water Pump Gasket Kit (01–10 Duramax): GS33752
- Mahle GS34005 Engine Oil Cooler Gasket Set (01–16 Duramax): GS34005
- Mahle F31903 Exhaust Manifold to Up-Pipe Gasket (01–16 Duramax): F31903
- Mahle F32918 Up-Pipe to Turbo Gasket (01–16 Duramax): F32918
- Mahle GS33757 Valve Cover Gasket & Injector Seal Kit (01–04 LB7): GS33757
What’s Included
- (1) B45974 valve stem oil seal (sold individually). For a full engine service, order quantity 16.
Why CPP Diesel
- Fast shipping, diesel-specific support, and curated Mahle coverage for Duramax platforms.
FAQ
Is B45974 a single seal or a full set?
B45974 is the individual seal. For a complete set, purchase 16 pieces (one per valve).
Will it fit LB7/LLY/LBZ/LMM?
Yes—this seal covers 2001–2010 6.6L Duramax LB7, LLY, LBZ, and LMM applications.
Any install tips?
Clean the guides and valve stems and use the proper sleeve/driver to avoid damaging the sealing lip.
Specifications for Mahle B45974
| Attribute | Value |
|---|---|
| Brand | Mahle |
| Part Number | B45974 |
| UPC | 27067929532 |
| GTIN | 027067929532 |
| Engine Compatibility | 2001–2010 GM 6.6L Duramax (LB7/LLY/LBZ/LMM) |
| Construction | Metal shell with molded elastomer lip |
| Package Dimensions (W×H×D) | 6.00" × 6.00" × 6.00" |
| Shipping | Standard ground; calculated at checkout |
| Prop 65 | Not specified by manufacturer. See www.P65Warnings.ca.gov. |
