SKU: 95048986382

RISLONE Heavy Duty Rear Main Seal Repair 44240

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Ships within 48 hours · Estimated delivery Aug 10 - Aug 15

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Description

RISLONE Heavy Duty Rear Main Seal Repair 44240Most rear main seal leaks are caused by a combination of normal wear in the crankshaft & seal and the drying, hardening and shrinking of the main seal. Rislone Rear Main Seal Repair restores the seal to like new condition and also contains additives to stop leaks in severely worn seals and crankshafts. Compatible with all petroleum based engines oils including high mileage kilometer and synthetic. Works with ALL vehicle types including petrol, LPG,

Most rear main seal leaks are caused by a combination of normal wear in the crankshaft & seal and the drying, hardening and shrinking of the main seal. Rislone Rear Main Seal Repair restores the seal to like new condition and also contains additives to stop leaks in severely worn seals and crankshafts. Compatible with all petroleum based engines oils including high-mileage / kilometer and synthetic. Works with ALL vehicle types including petrol, LPG, diesel and turbocharged.  
  • Stops All Oil Leaks
  • Seals Timing Cover, Cam Seal, Rear Main Leaks
  • Seal Restorer
  • Seal Polymer

Dosage & Directions 

Dosage
1 bottle treats 3.5 to 6L of oil. Larger systems use 1 bottle for every 5L of oil capacity.

Directions
Add entire bottle of Rear Main Seal Repair to engine crankcase at or between oil changes. Do not overfill. Most leaks will stop within 150 km or 2 days of driving. To prevent future leaks, install Rear Main Seal Repair every 8,000 km or with every oil change.

Compatibility

Rislone Rear Main Seal Repair works with all petroleum-based motor oils including conventional, high kilometre and synthetic formulas.

Use in ALL 4, 6 and 8 cylinder vehicles, with petrol, LPG, Diesel, turbo or racing engines. Works in motorbikes/vehicles with a wet clutch system, however dosage is is 93ML/1L of oil.

Rislone Rear Main Seal is comapatible with Rislone Engine Treatment, Rislone Compression Repair and Rislone Oil Treatment..

If you are unsure what other additives could be in the oil system prior to adding Rislone, it is recommended to flush the system first.

Frequently Asked Questions

What is a rear main seal?
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 snug 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 kilometre. 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 PCV (Positive Crankcase Ventilation) system is not functioning correctly, leaks can occur. The PCV 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.

Do I need to use Rislone Rear Main Seal with every oil change?
No, we have found that you can receive good results if you reuse the product every other oil change.

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 kilometers.

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.

Technical Information

SAFETY DATA SHEET
CODE: 44240
SIZE: 500ML

    Shipping Notes
    • Free Standard Shipping on $100+ Orders to the USA.
    • Except Preorder products are shipped in 48 hours.
    • Delivery to the USA:
    1. Standard Shipping : 3-10 business days
    • If time is of the essence, please consider selecting expedited delivery for faster service.
    Exchange/Return Notes
    • We offer a 30-day return/exchange service after receiving.
    • Final sale items are not eligible for returns or exchanges.
    • To process your return/exchange, please contact us at [email protected]
    • Please click here for more details>>> Return & Exchange Policy
    SKU: 95048986382

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    4.6 ★★★★★
    Based on 18 reviews
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    Product Reviews
    L
    Verified Purchase
    Laura A.
    Boise, US
    ★★★★★ 4
    These are great!
    Size: Medium, Pattern Name: Pack of 2
    My dog loves these and now won't play fetch with any other ball. I love that they glow bright so we can play fetch after I get home from work (it gets dark around 5 now). The dog and I both like that they whistle. They also squish easily and he loves to chomp on them while he runs around. Only reason I took off a star is because he chewed a piece of it off and now it doesn't whistle or fly as far. That being said, it seems to stand up well to all the chomping he does on it. I should not have left him alone with it, I think he held it down and pulled on it. If your dog usually makes it his mission to destroy things I wouldn't leave him alone with it, other than that I absolutely recommend these. Update 12/12/20: I got another dog last year and he also loves these balls. Probably the favorite ball for both dogs, they go into hyperdrive when they see them. New dog tends to be more destructive than the older one and I still don't leave them unattended with these balls, but new dog has not destroyed one. I made the mistake of leaving one in the Chuckit overnight once. Ball was wet from playing in the snow and became lopsided. Now doesn't fly very well but my weird dog still likes it. It is also starting to dry out and crack. None of the other glow balls have done this, I'm assuming it is also from leaving it in the Chuckit overnight. Other than that, these balls are great. I did read a few reviews that said charging them with UV light made them stay brighter for a longer period, but I did not notice a difference in my quick test of this theory. Just keep a good flashlight with you and brighten them up as needed.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on December 6, 2018
    M
    Verified Purchase
    M
    Lake Worth, US
    ★★★★★ 5
    Good for night sessions
    Size: Medium, Pattern Name: Pack of 1
    Picked this up for evening fetch sessions and it’s been a win. It charges up fast, couple minutes under a lamp or in sunlight and it’s good to go, and the glow is genuinely bright, not the sad dim purple some of these put out. Makes it way easier to find in the yard at dusk, and the dog can actually track it. It’s a little on the softer side compared to a regular tennis ball, but durable enough to hold up to my big dog, who is not gentle with toys. Still kicking after plenty of chomping and slobber. Fits a standard Chuckit! launcher perfectly, which is the whole point. Pros: • Glows brightly and clearly in the dark • Charges fast from any light source • Holds up well even with a big, enthusiastic chewer • Fits standard ball-throwing sticks • Great for evening or early-morning fetch Cons: • A bit softer than a regular tennis ball — a determined power-chewer could probably destroy it eventually • Glow fades after a while, so you’ll need to recharge it during long sessions • Only glows if it’s been charged, which is obvious but easy to forget Tips: • Charge it under a bright light or in the sun for a few minutes before heading out • A flashlight works in a pinch if you forgot to charge it • Keep it out of permanent fetch duty — rotate with a regular ball so it lasts longer • Not a chew toy, even though it’s tempting to leave it with the dog Five stars. If you’ve got a dog and a yard, this makes evening fetch actually doable.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 24, 2026
    V
    Verified Purchase
    VOKLST
    Bozeman, US
    ★★★★★ 5
    Westies Fav
    Size: Small, Pattern Name: Pack of 1
    Best Westie ball ever, my dog loves this ball. Exactly her size! 3" tennis balls are too big & she rips the fur off. this silicone-ish ball has no fur & is 2&1/2 " We have 2" balls from her electronic ball laucher, but she still loves this glow in the dark best!
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 4, 2026
    B
    Verified Purchase
    Book Junkie
    Chelsea, US
    ★★★★★ 5
    Best dog ball in the world!
    Size: Large, Pattern Name: Pack of 1, Size: Large, Pattern Name: Pack of 1
    My dog is singularly obsessed with playing ball. He would drop a steak to chase a ball. (He'd return to the steak, but not without the retrieved ball. He's not an idiot.) He makes dangerous leaps, crashes into trees, and runs fast enough to catch thrown balls before they even hit the ground. Since he doesn't care about his own wellbeing, it's my job to protect him as much as I can. And a lot of balls are hard enough to cause him pain or dental damage when he mistimes a catch. Enter the ChuckIt Glow Ball! The minute Cowboy got his first Glow Ball, he no longer had any interest in the dozens of tennis balls scattered around the house and yard. If I took the Glow Ball away and instead threw a tennis ball, Cowboy would run to retrieve the ball, then return without it and begin looking all over the house for the Glow Ball. The Glow Ball is tough enough to survive Cowboy's big, sharp chompers, yet it's soft enough to do no harm when it hits him in the face. The glow feature is a huge bonus, too. Cowboy gets distracted by chipmunks and squirrels when we're playing, so he sometimes can't remember where he dropped the ball to pursue the interloper. If the ball was exposed to enough light before it was misplaced, it will be easy to find once the sun goes down. (Otherwise, Cowboy always finds it eventually.) When I'm feeling nocturnal, I'll put the ball under a light for a few minutes to activate the electrons, then treat my boy to a middle-of-the-night game of fetch. I was so happy to see these on sale, I bought a lifetime supply for my pantry. The size guide seems accurate. ChuckIt recommended the large size for a dog of Cowboy's weight and that size is perfect. Highly recommended product.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on October 14, 2024
    G
    Verified Purchase
    Gebo
    Grantham, US
    ★★★★★ 5
    Best chucker available
    Style: Classic + 2pk Ball, Size: 26in
    Best chucker out there, saved my arm throwing the ball, get great distance with this, and it quality made, should last a long time.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on April 23, 2026

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