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Genuine GM Fluid 12378521 RTV Engine Sealant - 5.3 oz. Cartridge

4.4 (8) Write Review
Free shipping on orders over $29.99

$19.95

$ 7 .99 $7.99

In Stock
  • Original production sealant used in GM engine plants
  • Recommended for all engine applications
  • Compatible with all synthetic, synthetic blend, and minerals oils as well as coolants including DEX-COOL
  • Special precautions: Surface should be free of residual fluids and also of detergent residues
  • Special precautions: Joints should be closed within 20 minutes of application; final tightening should be done within one hour of application and closure


A one-component room-temperature vulcanizing (RTV) sealant. A high viscosity product that cures when exposed to air. The cured material has superior adhesion and elongation properties and is very resistant to engine oils and coolants. It is also oxygen sensor safe and will not corrode metal surfaces. This is the original production sealant used in GM engine plants. The sealant is compatible with all synthetic, synthetic blend, and minerals oils as well as coolant including DEX-COOL. The assembly may be filled with oil or coolant immediately after applying the sealant and torqueing the bolts. The maximum working time of this sealant is 20 minutes. The sealant will fully cure in 24 hours. Recommended for all engine applications.


articcolds
Reviewed in the United States on March 9, 2022
Always use this stuff as it has perfect adhesive properties as many don't. I don't have to worry about leaks or not bonding if prepped correct. Make sure you clean your surface off with alcohol or something similar for a solid leak proof bond
Louis Pusztay III
Reviewed in the United States on March 27, 2021
Outstanding product to prevent leaking and already leaking fluids of an engine.
joe c.
Reviewed in the United States on February 23, 2021
best sealant on the market
Lisa M Rice
Reviewed in the United States on July 15, 2020
Best sealant you can buy. I keep 2 on hand for any sealing type jobs on vehicles.
Customer
Reviewed in the United States on June 5, 2019
Purchased this to replace the upper oil pan seal on my truck and when I received the package the expiration date was purposely removed. Now I have to hope it is still good and will seal correctly
Paul D Healy
Reviewed in the United States on March 21, 2018
It’s the only sealant to use when doing a oil pan replacement. Let cure overnight no leaks. Well worth the price do it once and forget about leaks
Paul McDaniel
Reviewed in the United States on October 21, 2018
The factory service manual specified engine sealant for all aluminum GM engines. Same product as ACDelco 10-2010 RTV Engine Sealant
BearGFR
Reviewed in the United States on April 20, 2018
Very good sealant. I was able to get a leak-tight seal at the rear of the oil pan on a traditional Pontiac V8 using this product. If you know about Pontiacs, then you know how significant an achievement that was.