CUMMINS 3973512 GENUINE ENGINE OIL CAP O-RING SEAL FOR 1998.5-2018 DODGE RAM CUMMINS

The Cummins 3973512 engine oil cap O-ring seal is a factory OEM replacement for 1998.5-2018 Dodge Ram Cummins 5.9L and 6.7L diesel engines. Over time, the oil filler cap O-ring can wear out, dry, or crack, leading to oil seepage and engine bay mess. Replacing it ensures a leak-free, factory-tight seal.

Features & Benefits

• OEM Replacement: Genuine Cummins part ensures exact fit and sealing.
• Prevents Oil Leaks: Stops seepage around the oil filler cap.
• Durable Material: Resists oil saturation, heat, and long-term wear.

Fitment

• 1998.5-2002 Dodge Ram 5.9L Cummins 24V VP44
• 2003-2007 Dodge Ram 5.9L Cummins Common Rail
• 2007.5-2018 Dodge Ram 6.7L Cummins Common Rail

Cross Reference Part Numbers

• Cummins 3973512
• Replaces aftermarket equivalents: M-3973512

Frequently Asked Questions

When should I replace the oil cap O-ring seal?

If you notice oil seepage, cracks in the O-ring, or if the filler cap feels loose, it's time to replace it.

Does this part include the oil filler cap?

No, this is the O-ring seal only. The oil filler cap must be purchased separately if damaged.

Can this O-ring be reused?

No, it's recommended to replace the O-ring during service anytime it is removed or shows signs of wear.

Maintenance Note

Pro Tip: When replacing this seal, inspect the valve cover gasket and oil pump for leaks to ensure a fully sealed oil system.

Fitment

• 1989 Dodge Ram 2500/3500 5.9L Cummins
• 1990 Dodge Ram 2500/3500 5.9L Cummins
• 1991 Dodge Ram 2500/3500 5.9L Cummins
• 1992 Dodge Ram 2500/3500 5.9L Cummins
• 1993 Dodge Ram 2500/3500 5.9L Cummins
• 1994 Dodge Ram 2500/3500 5.9L Cummins
• 1995 Dodge Ram 2500/3500 5.9L Cummins
• 1996 Dodge Ram 2500/3500 5.9L Cummins
• 1997 Dodge Ram 2500/3500 5.9L Cummins
• 1998 Dodge Ram 2500/3500 5.9L Cummins
• 1999 Dodge Ram 2500/3500 5.9L Cummins
• 2000 Dodge Ram 2500/3500 5.9L Cummins
• 2001 Dodge Ram 2500/3500 5.9L Cummins
• 2002 Dodge Ram 2500/3500 5.9L Cummins
• 2003 Dodge Ram 2500/3500 5.9L Cummins
• 2004 Dodge Ram 2500/3500 5.9L Cummins
• 2005 Dodge Ram 2500/3500 5.9L Cummins
• 2006 Dodge Ram 2500/3500 5.9L Cummins
• 2007 Dodge Ram 2500/3500 5.9L Cummins
• 2008 Dodge Ram 2500/3500 6.7L Cummins
• 2009 Dodge Ram 2500/3500 6.7L Cummins
• 2010 Dodge Ram 2500/3500 6.7L Cummins
• 2011 Dodge Ram 2500/3500 6.7L Cummins
• 2012 Dodge Ram 2500/3500 6.7L Cummins
• 2013 Dodge Ram 2500/3500 6.7L Cummins
• 2014 Dodge Ram 2500/3500 6.7L Cummins
• 2015 Dodge Ram 2500/3500 6.7L Cummins
• 2016 Dodge Ram 2500/3500 6.7L Cummins
• 2017 Dodge Ram 2500/3500 6.7L Cummins
• 2018 Dodge Ram 2500/3500 6.7L Cummins

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