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Up to 25% Off Online Orders of Select Parts & Accessories. Enter Promo Code MMJ25 in Cart.

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Receive Up To 25% Off Your Online Purchase Of Select Parts and Accessories Instantly

When items are added to the cart, the discount will automatically deduct off the price of the qualifying items. Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installation, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes select products, items already on sale and MAP priced brands & items. For full category inclusions and disclaimers, See Details Here. Valid online until 11:59 PM EST on 5/31/18.

Additional Promotions Not Included in the above:

Receive 10% Off Select Wagner branded brake parts with your online purchase. Use promotional code: WAGNER10.

Receive 10% Off Select Champion branded products with your online purchase. Use promotional code: CHAMP10.

Receive 10% Off Select FelPro branded products with your online purchase. Use promotional code: FELPRO10.

Oil Seals


Oil Seals

Oil seals are devices that hold or separate fluids of various types to ensure larger assemblies (transmissions, differentials, engines, etc.) continue to function where lubrication or fluid separation are required to reduce friction and wear.

What is an oil seal and how does it work

How Does It Work?

  • Small membrane of oil (viscous fluid) separates the rubber from the metal or non rubber component by way of a hydraulic pressure barrier of oil created through motion and geometric down force of the seal head.

How Is it Made?

  • Metal stampings are pressed out, rubber is mixed to suit conditions, both parts are then compressed together and bonded in a larger press to form a seal.

Why Does it Fail?

  • Seals can dry out if not used for a period of time.
  • Severe driving conditions, including cold, can crack seals.
  • Drivetrain damage such as a damaged driveshaft or drive axles can cause excess vibration and seal wear.
  • Aging seals and bearings can pull away from the surface they mate with and leave too much space, allowing oil to escape.
  • Improper maintenance.

What are the Symptoms of Failure?

  • Fluid deposits.
  • Fluid leaks.
  • Noise due to friction related to lack of lubrication.

What are the Implications of Failure?

  • Catastrophic failure can mean engine, transmission, or differential damage.
  • Very minor implications can include small leaks.
  • Shorten assemble life.
  • Depending on the severity of the failure, repairs can be costly.

How Difficult is the Install?

Difficulty Rating:


  • Installation difficulty can vary from simple to complicated depending on where the oil seal needs to be replaced.

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