Concentrated Rear Main Seal Repair

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What it's for:
  • engine
What it does:
  • Stops Leaks
  • Repairs
  • Stops All Oil Leaks
  • Seals Rear Main, Cam Seal and Timing Cover Leaks
  • Restores Shrunk and Hardened Seals
  • Use in Gasoline & Diesel Engines
  • What is a rear main seal?

    The simple answer is: A seal that fits around the rear of the crankshaft to prevent oil leakage.

    The more in depth answer is:
    A rear main seal, also known as a main seal or rear main bearing seal is located between the engine and transmission. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel & transmission bolt to this crankshaft. The engine oil lubricates the crankshaft, pistons and other internal parts of the engine. The rear main seal is inserted into the back of the block and fits snuggly around the rear of the crankshaft and keeps the engine oil from escaping.

  • What are the symptoms of a rear main seal leak?

    Depending on the severity of the leak the first thing you may notice is the oil level going down. The next thing that happens is spotting, where you will find oil spots, located on the driveway or garage. While looking under the vehicle around the area where the engine and transmission connect, you will find oil dripping, or an oil residue with dirt caked on this part of the vehicle, most noticeably under the oil pan and the front of the transmission. In some transmissions, it will actually be the oil leaking out of the front of the transmission. In some manual transmission vehicles, you may also notice some slipping of the clutch, which can occur with a leaking rear main seal.

  • What causes the rear seal to leak?

    The most common cause of rear seal leaks is age and/or high mileage. The seal can also leak due to the vehicle being stored for an extended period of time, or from running the engine low on oil. This causes drying and hardening of the seal leading to shrinking, cracking and tearing of the rear main seal.

  • What other factors can contribute to a rear main seal leak?

    A few things can cause a rear main seal leak to worsen, which are not the fault of the seal itself. If the oil level is two high (filled over the full mark) or the PVC (Positive Crankcase Ventilation) system is not functioning correctly, leaks can occur. The PVC system prevents pressure from building up inside the engine and if it fails, the pressure will cause the oil to leak out. It is a good idea to clean or replace the PCV valve regularly to prevent this problem.

  • How do you replace a rear main seal?

    For most rear wheel drive vehicles the transmission is removed to replace the seal. On front wheel drive vehicles, it is usually easiest to remove the engine to gain access to replacing the seal. Either way, this is an expensive procedure.

  • What else can be done to stop a leaking rear seal other than replacement?

    Rislone Rear Main Seal Repair is one of the only products of its kind on the market specifically designed to solve rear seal oil leaking problems. There are special oil additives on the market that are designed to swell the rubber of the rear seal and cause it to expand, thus sealing off the leak. You can also try using thicker weight engine oil, like 50 weight. The thicker oil can fill in the gap between the seal and the crankshaft, and could slow the leak down.

  • How does Rislone Rear Main Seal Repair work?

    This product works in two ways to help solve most any seal type leak.
    1) The seal restorer additive restores seal size, flexibility and elasticity lost due to engine heat,
    age and high mileage.
    2) The seal polymer works by building a polymeric film around the rear main seal and also filling
    in any groove worn into the crankshaft by the seal.

  • What types of seals will Rislone Rear Main Seal Repair fix?

    Because of the Rislone 2X Action formula, the product has additives to work on any of the three types of rear main seals, no matter what the material.

  • What are the different kinds of rear main seals?

    (3 basic styles)
    o Also called a wick seal
    o Neoprene or called rubber o Silicone
    o Neoprene or called rubber o NBR or Buna N (Nitrile)
    o Silicone
    o PA or Polyacrylate
    o Viton or Fluoroelastomer

  • Will Rislone rear Main Seal Repair clog my oil filter?

    No. Unlike our cooling system products, Rislone Rear Main Seal Repair has no particles to plug the leak. It contains special polymers and seal conditioners to stop seal leaks.

An oil leak doesn’t have to ruin your day. While it is never good news to discover an oil leak from your vehicle, here at Rislone we have the fast, easy and affordable solution you need to get back on the road right away. Many engine oil leaks come from the rear main seal. This seal can dry out over time and eventually allow oil to escape. Most rear main seal leaks start out small, which is why most drivers don’t detect them right away. As your leak gets worse, you may see oil puddling under your vehicle when you’re parked or detect a low oil level or light on your dash.

If this happens, don’t panic. In most cases, a single bottle of Rislone Concentrated Rear Main Seal Repair is all it takes to stop your engine oil leak for good.
It couldn’t be easier — simply add our product to your engine crankcase (and top up with regular engine oil if your level is low) and you’re off! Our advanced formulation works instantly to stop your rear main seal leak right away, with no need to worry about a more expensive repair or trip to the dealership.

Physical repairs — including removing your old rear main seal (or other parts responsible for oil leaks) and installing a new one — are expensive propositions and require leaving your vehicle at a garage or dealership for the day. With Rislone Concentrated Rear Main Seal Repair, you become the mechanic yourself and let Rislone’s chemical engineering do the work. You don’t need any experience or tools. Simply purchase a bottle of our product from a local or online distributor and install it into your engine. Small and medium leaks will be stopped for good.

We have spent over 90 years perfecting our formulations, and our advanced technology works where other products fail. You simply won’t find a more reliable Rear Main Seal Repair product on the market, and in our experience many unproven products can do more harm than good.

Bear in mind that physical repairs (removing your rear cover and seal and installing a new one) may be necessary in some extreme cases, but many of our Canadian customers find that a single treatment with our concentrated formulation is sufficient. We have affordable solutions for many types of engine fluid leaks and have over 90 years experience stopping automotive fluid leaks.

Our current Concentrated Rear Main Seal Repair has been evolving over the years as auto technology has changed, and today is simply the best product for engine seal leaks on the market. Many older cars simply aren’t worth the investment to make costly repairs to leaking seals, so choose the affordable and reliable Rislone solution to get your car back on the road more many more miles of reliable service.

Whatever you do, don’t ignore an engine oil leak. A small leak will always become a bigger one and can catch you off guard if your oil level drops, leaving you stranded. A bottle of Rislone rear main seal additive today will have you ready at the first sign of a rear main seal oil leak. Contact us if you would like more information or check our list of Canadian distributors and get your Concentrated Rear Main Seal Repair today!

Part Number: 34240
Dosage: One bottle treats 4 to 6 liters of oil. Larger systems use 1 bottle for every 5 liters of oil capacity.
Size: 500mL
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