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Part #: GM12378521

ACDelco 12378521 Engine Sealant

Universal - 5.3 Oz Tube
Part #: GM12378521
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The ACDelco 12378521 Engine Sealant is the sealant used in GM engine plants. Reseal your engine components with the same high-quality sealer used in the GM Production Line. ACDelco Engine Sealant is a one-component, room-temperature vulcanizing (RTV) sealant. It is a high viscosity product that cures when exposed to air. The cured material has superior adhesion and elongation properties and is resistant to engine oils and coolants. It is also oxygen sensor safe and will not corrode metal surfaces. 


  • OEM Sealer 
  • GM Part#: 12378521
  • AC Delco Part#: 10-2010


  • MFG. Number 12378521
  • Manufacturer Name GM / ACDelco
  • Shipping Weight 2.00 lb.
  • Shipping Length 2 in.
  • Shipping Width 2 in.
  • Shipping Height 5 in.
  • UPC 707773905036


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