Dayco 5030243 Serpentine Belt

Part Number
Serpentine Belt

Fits: 95-05 Cadillac DeVille, 95-02 Cadillac Eldorado, 95-04 Cadillac Seville, 95-99 Oldsmobile Aurora, 01-03 Oldsmobile Aurora, 04-05 Pontiac Bonneville, 06-11 Buick Lucerne, 06-11 Cadillac DTS

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Designed for high mileage multiple-accessory drivesthe Dayco® “W” profile belt (patent pending) is the most innovative advancement in multi-rib belt design in over 25 years. Developed through extensive laboratory and actual road mileage testing, this unique rib profile has been specifically Dayco® engineered to conform to high mileage, worn or misaligned drives without a sacrifice in quiet, long-lasting performance. The "W" profile cut into the tip of each rib makes the tip more flexible and eliminates belt chirp when the belt enters a worn or misalligned pulley. Constructed with Aramid reinforced EPDM compounds, the Dayco® “W” profile belt delivers more than OE required delivers the solution to troublesome drive problems. Dayco® Poly-Rib® Belts meet or exceed SAE J1459 and SAE J2432 specifications.

BRAND: Dayco




Cross SectionK-Section
Effective Length24.25
Effective Length615.95
MaterialEPDM, Aramid Reinforced
Maximum Operating Temperature212
Maximum Operating Temperature100
Minimum Operating Temperature-45
Minimum Operating Temperature-42.7
Outside Circumference24.91
Outside Circumference632.72
Rib DepthStandard
Rib ProfileStraight Rib
StandardsSAE J1459, SAE J2432
Top Width.40



  • Goodyear: 4030242
  • NAPA: 25-70623
  • ACDelco: 3K243
  • General Motors: 12588412
  • General Motors: 12555957
  • General Motors: 3545016
  • CARQUEST: K030245
  • ACDelco: 3K245
  • CARQUEST: K030243
  • General Motors: 12557551
  • General Motors: 3455016
  • NAPA: 25-030243
  • General Motors: 12555597
  • Gates: K030245
  • Duralast: 243K3
  • NAPA: 25-030245
  • Goodyear: 4030245
  • Gates: K030243
  • General Motors: 12570499
  • Driveworks: 243K3


  • 1995-2005 Cadillac DeVille - Position: Water Pump
  • 2001-2003 Oldsmobile Aurora - Position: Water Pump
  • 1995-2002 Cadillac Eldorado - Position: Water Pump
  • 1995-1999 Oldsmobile Aurora - Position: Water Pump
  • 2006-2011 Buick Lucerne - Position: Water Pump
  • 1995-2004 Cadillac Seville - Position: Water Pump
  • 2006-2011 Cadillac DTS - Position: Water Pump
  • 2004-2005 Pontiac Bonneville - Position: Water Pump
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