Concentrated Rear Main Seal Repair

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What it's for:
  • Engine
What it does:
  • Repairs
  • Stops Leaks
  • Stops Noise
  • Cleans
  • Performance
  • Lubricates
  • 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)
    ROPE SEAL
    – Also called a wick seal

    TWO PIECE SEAL
    – Neoprene or called rubber
    – Silicone

    ONE PIECE SEAL
    – Neoprene or called rubber
    – NBR or Buna N (Nitrile)
    – Silicone
    – PA or Polyacrylate
    – 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.

Oil leaks – nobody likes them, but many people experience them. One of the most common reasons for an oil leak is when a vehicle’s rear main seal becomes damaged or hardened. When this happens, you want an affordable fix. Taking your vehicle to a garage for service is a hassle and can cost a lot of money, especially if the seal has to be replaced. Before you go to the trouble and expense, consider trying our Rislone Concentrated Rear Main Seal Repair. It’s sold hundreds of thousands of bottles worldwide for a reason – it just works.

For nearly a century, Rislone has been a leader in engine repair fluids and stop leak products. We have tweaked and improved our chemical formulations over the years and today they represent the most advanced and reliable stop leak products on the market. Most of our customers see a stop to their rear main seal oil leak almost immediately. In most cases, a single application is enough.

Because our engine oil additives are compatible with all engine oils, you can use multiple applications if you have a large leak that doesn’t seal right away. Thanks to the concentrated nature of our Rear Main Seal Repair product, you can be sure it’s your best chance at stopping small to moderate oil leaks now and for good. No other products combine our value, performance and quality — so don’t waste your money on unproven products that you’ve never heard of before.

Why You Shouldn’t Ignore an Oil Leak

No oil leak should be ignored. Leaking oil can be a sign of multiple problems in your engine. In the case of your block’s rear main seal, leaking oil can mean:

  • You have a cracked or blown rear mean seal.
  • You have some warping of the rear cover or oil pan.
  • You have some loosening of your rear cover bolts.

No matter what the cause of your rear seal oil leak, getting at the seal to repair it is a complicated affair. That’s because your flywheel and transmission are bolted up against your engine block in this location. The only way to replace the rear main seal is to partially or fully remove your engine, depending on the model and configuration of your vehicle. We don’t know about you, but that’s not something we want to do if we don’t have to. It’s expensive and time-consuming.

Thankfully, in most cases you don’t. Rislone is engineered as a fast, easy and affordable solution to engine problems like rear main seal leaks. Our Concentrated Rear Main Seal Fix has helped countless drivers keep their vehicles on the road long after they would have, had they not tended to their rear seal leak.

A Helpful Team

At Rislone, the quality and reputation of our products are our hallmarks, but that doesn’t stop us from offering unbeatable customer service. Contact our team today if you would like to know more about how our best rear main seal additive will seal your leak quickly. At the first sign of an oil leak from the back of your engine, a bottle of Rislone Concentrated Rear Main Seal Fix is all it takes to keep you on the road for many more kilometers.

Part Number: 24240
Dosage: One bottle treats 4 to 6 litres of oil.
Size: 500 mL
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