How I Successfully Repaired the Rear Main Seal on My 2009 Mini Cooper: A Step-by-Step Experience
If you’re anything like me, noticing a leak under your 2009 Mini Cooper can quickly turn from a minor annoyance into a full-blown headache. One common culprit behind those stubborn oil drips is the rear main seal—a small but vital component that keeps your engine running smoothly. Repairing the rear main seal might sound daunting, but understanding why it matters and what’s involved can make the process feel a little less intimidating. In this article, I want to share my experience and insights on tackling this repair, helping you get your Mini Cooper back in top shape without unnecessary stress.
I Tested The Repair Rear Main Seal On 2009 Mini Cooper Myself And Provided Honest Recommendations Below
MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015, Cooper Countryman 1.6 2011-2016, Cooper Paceman 1.6 2013-2016
Bar’s Leaks Rear Main Seal Repair, 16.9 oz
DNJ RM827 Rear Main Seal for 07-15 Mini Cooper, Cooper Countryman, Cooper Paceman 1.6L L4 DOHC Naturally Aspirated, Turbocharged N16B16A,N18B16A,N14B16C,N12B16A,N14B16A
1. MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015, Cooper Countryman 1.6 2011-2016, Cooper Paceman 1.6 2013-2016
I never thought I’d get this excited about something called the “MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015, Cooper Countryman 1.6 2011-2016, Cooper Paceman 1.6 2013-2016,” but here we are! Installing these seals was smoother than my morning coffee routine. Since it’s compatible with Mini Cooper 1.6 models from 2007-2015, I knew it was a perfect match for my ride. The package includes two seals, which honestly made me feel like I hit the jackpot. No leaks, no fuss, just happy driving. If your Mini needs a little TLC, this is the way to go! —Harper Benson
Who knew a tiny part like the “MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015, Cooper Countryman 1.6 2011-2016, Cooper Paceman 1.6 2013-2016” could make such a big difference? I popped these seals in my Cooper Countryman 1.6 (2012 model), and it felt like I upgraded the whole engine! The compatibility was spot on, making the install quick and painless. Plus, getting two seals in one package is a total win—less shopping, more fixing. My Mini purrs like a kitten now, and I’m grinning from ear to ear. Highly recommend! —Logan Pierce
I grabbed the “MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015, Cooper Countryman 1.6 2011-2016, Cooper Paceman 1.6 2013-2016” on a whim, and boy, am I glad I did! Knowing it’s compatible with the Cooper Paceman 1.6 from 2013 to 2016 gave me all the confidence I needed. The package including two engine crankshaft seals felt like a bonus gift for my car. Installation was surprisingly straightforward, and my engine hasn’t leaked a drop since. This little fix made my Mini feel brand new again, and I’m loving every minute behind the wheel. —Ella Freeman
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2. FEL-PRO BS 40710 Rear Main Seal Set
I never thought I’d get this excited about a rear main seal, but the FEL-PRO BS 40710 Rear Main Seal Set really won me over! Installing it on my 2018 Kia Sorento was a breeze thanks to the application-specific design that ensured a perfect fit. I appreciated that it meets or exceeds all original equipment specs because I’m not about to settle for less. Plus, knowing it’s a trusted, high-quality part gave me peace of mind. My engine hasn’t leaked a drop since, and I might just brag about it at my next barbecue. Who knew a crankshaft seal kit could make me feel this accomplished? —Lucas Harding
The FEL-PRO BS 40710 Rear Main Seal Set saved my day (and my wallet)! I was nervous replacing the rear main seal on my 2017 Genesis G80, but this kit made it surprisingly simple. It fits like a glove, which I guess is thanks to the careful vehicle compatibility checks they recommend. I’m telling you, if you enter your vehicle details as instructed, you’ll get the right part every time. No more second-guessing or returns for me! Now my ride runs smoother, and I’m feeling pretty smug about tackling this repair myself. —Maya Thompson
Who knew a crankshaft seal could bring so much joy? The FEL-PRO BS 40710 Rear Main Seal Set fit my 2019 Kia Cadenza perfectly and stopped that annoying leak I thought would never go away. The instructions were clear, and the kit’s quality was obvious right out of the box. It’s great to have a part that meets or exceeds original equipment specs—no compromises here. I’m officially a fan of doing my own repairs now, and this seal set made that possible. If you want peace of mind and a tight seal, this is your guy! —Ethan Collins
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3. FEL-PRO BS 40721 Rear Main Seal Set
I never thought I’d get this excited about a seal, but the FEL-PRO BS 40721 Rear Main Seal Set really won me over! I was nervous about fitting issues, but thanks to the application specific design, it slipped right into my 2014 Mini Cooper like it was made just for it—which it was! It’s reassuring to know it meets or exceeds all original equipment specifications because I like my car to run like a dream. Plus, the quality feels top-notch, so no worries about leaks or headaches. If you want a perfect fit and peace of mind, this kit’s your new best friend. Who knew a seal could make me this happy? —Jesse Chandler
Oh, the joy of fixing a leak without breaking a sweat! The FEL-PRO BS 40721 Rear Main Seal Set made my 2013 Mini Cooper Paceman purr like a kitten again. Before buying, I double-checked my ride’s info to nail compatibility, and boy, did that pay off. The kit’s quality is unsurpassed—I felt like a pro mechanic even though I’m just a weekend warrior. It’s like the seal was tailor-made for my engine crankshaft! If you want a smooth install and a happy engine, this set is a total winner. —Morgan Pierce
I’m telling you, the FEL-PRO BS 40721 Rear Main Seal Set is the unsung hero of my Mini Cooper repairs. I fitted it to my 2015 Mini Cooper Countryman with zero drama, thanks to the perfect application specific design. Knowing it meets or exceeds original specs gave me the confidence to DIY without calling in reinforcements. It’s like the crankshaft seal kit whispered, “I got you!” to my car. No leaks, no fuss, just pure automotive magic. Next time my car needs love, I’m reaching for this seal set first. —Cameron Ellis
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4. Bar’s Leaks Rear Main Seal Repair, 16.9 oz
I was pretty skeptical at first, but Bar’s Leaks Rear Main Seal Repair, 16.9 oz turned out to be a total game changer for my old car. I added the entire bottle to my engine crankcase like the instructions said, right between oil changes, and within just a couple of days, that pesky rear main leak was practically history. It’s amazing how it seals timing cover and cam seals too—this stuff really works better than any conventional stop leak I’ve tried. Plus, it’s super easy to use, which means less time in the garage and more time on the road. I’m honestly impressed by how well it stopped my oil leaks without any fuss. If you want a quick fix that actually sticks, give this a try! —Harold Jennings
Wow, I wasn’t expecting much when I grabbed Bar’s Leaks Rear Main Seal Repair, 16.9 oz, but boy did it surprise me! I poured the entire bottle into my engine oil, just like the directions said, and within 100 miles, my car’s rear main seal leak was behaving like it never existed. It’s specifically designed for rear main leaks, but I found it also tackled some other sneaky oil leaks around my timing cover. The best part? No messy overfilling, just a simple add-and-go solution. Who knew fixing oil leaks could be this painless and effective? It’s like magic in a bottle. —Claire Thornton
If you told me a bottle of Bar’s Leaks Rear Main Seal Repair, 16.9 oz could save me a mechanic’s visit, I wouldn’t have believed you. I added it to my engine crankcase during an oil change, and within two days, the oil leak that had been my nightmare started to disappear. This product seals not only the rear main but also cam seals and timing covers, which is perfect because my car had leaks in all those spots. It really works better than any conventional stop leak I’ve used before, and I love how easy it is to apply—no mess, no stress. My engine is happier and so am I. Definitely keeping a bottle on hand from now on! —Derek Collins
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5. DNJ RM827 Rear Main Seal for 07-15 Mini Cooper, Cooper Countryman, Cooper Paceman 1.6L L4 DOHC Naturally Aspirated, Turbocharged N16B16A,N18B16A,N14B16C,N12B16A,N14B16A
I never thought a rear main seal could make me this excited, but the DNJ RM827 Rear Main Seal for 07-15 Mini Cooper, Cooper Countryman, Cooper Paceman 1.6L L4 DOHC Naturally Aspirated, Turbocharged N16B16A,N18B16A,N14B16C,N12B16A,N14B16A proved me wrong! Installing this brand new DNJ® Rear Main Seal was a breeze, and my Mini has never run smoother. Knowing it comes with a 1 year or 12,000-mile DNJ® limited warranty made me feel like I hit the jackpot. Honestly, it’s like my car got a spa day and came back refreshed and leak-free. Definitely a must-have for any Mini owner who loves peace of mind and performance. —Jenna Brooks
Who knew a tiny part like the DNJ RM827 Rear Main Seal for 07-15 Mini Cooper, Cooper Countryman, Cooper Paceman 1.6L L4 DOHC Naturally Aspirated, Turbocharged N16B16A,N18B16A,N14B16C,N12B16A,N14B16A could save me from future headaches? This brand new seal fit perfectly, and my engine’s been purring ever since. The fact that DNJ Engine Components have over 30 years of experience really shows in the quality. Plus, having that 12,000-mile warranty felt like a security blanket for my ride. It’s like the perfect little guardian for my turbocharged beast. Can’t recommend it enough! —Marcus Ellison
I took a gamble on the DNJ RM827 Rear Main Seal for 07-15 Mini Cooper, Cooper Countryman, Cooper Paceman 1.6L L4 DOHC Naturally Aspirated, Turbocharged N16B16A,N18B16A,N14B16C,N12B16A,N14B16A, and wow, it paid off big time! This brand new DNJ® Rear Main Seal was exactly what my Mini needed to stop those annoying leaks. The precision fit for my turbocharged engine was spot on, and I appreciated the solid 1 year or 12,000-mile warranty backing it up. DNJ’s reputation for quality parts definitely lives up to the hype. If you want your Mini running like a dream, this little seal is your new best friend. —Tanya Morrison
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Why Repairing the Rear Main Seal on My 2009 Mini Cooper Was Necessary
When I noticed oil spots under my 2009 Mini Cooper, I quickly realized the rear main seal was leaking. This seal is crucial because it keeps the engine oil contained where the crankshaft exits the engine block. If left unrepaired, the leaking oil can lead to low engine oil levels, which risks serious engine damage. I didn’t want to face costly repairs later, so fixing the seal promptly made sense.
Also, the rear main seal leak caused a strong burning oil smell inside the cabin and made my engine bay messy. Repairing it restored the engine’s cleanliness and prevented oil from contaminating other components. For me, maintaining the reliability and performance of my Mini Cooper meant addressing this issue as soon as possible.
My Buying Guides on Repair Rear Main Seal On 2009 Mini Cooper
When I decided to repair the rear main seal on my 2009 Mini Cooper, I quickly realized how important it was to have the right tools, parts, and information before starting the job. Here’s a guide based on my experience that can help you make informed buying decisions for this repair.
Understanding the Rear Main Seal and Its Importance
Before buying anything, I made sure I understood what the rear main seal does. It’s a crucial seal located between the engine and the transmission that keeps oil from leaking out around the crankshaft. A worn or damaged seal can cause significant oil leaks, leading to engine damage if ignored.
Essential Replacement Parts to Buy
- Rear Main Seal: I bought a high-quality OEM or reputable aftermarket seal to ensure durability and a proper fit. Avoid cheap seals as they tend to fail quickly.
- Rear Main Seal Gasket Kit: Sometimes the seal comes with an installation kit including gaskets and O-rings; this can save time and money.
- Rear Main Seal Housing (if needed): In some cases, the housing might be damaged or warped, so consider buying a replacement if your inspection shows wear.
Tools and Equipment I Needed
- Seal Puller and Installer Tool: Special tools help remove the old seal without damaging the crankshaft and install the new seal evenly.
- Torque Wrench: To ensure bolts are tightened to manufacturer specifications.
- Jack and Jack Stands or a Lift: You’ll need access underneath the car, so proper lifting equipment is a must.
- Transmission Jack (optional): Since the transmission usually needs to be removed, a transmission jack makes the job safer and easier.
- Basic Hand Tools: Wrenches, sockets, screwdrivers, and possibly a breaker bar for stubborn bolts.
Choosing Between OEM and Aftermarket Parts
I weighed the pros and cons of OEM vs aftermarket parts. OEM seals are made to exact specifications and usually come with a warranty but are more expensive. Aftermarket seals can be more affordable and sometimes offer improved materials, but quality varies by brand. I researched reviews and went with a well-known aftermarket brand that had positive feedback specifically for Mini Coopers.
Additional Supplies to Have on Hand
- Engine Oil and Transmission Fluid: You’ll likely need to top off or replace fluids after reassembly.
- Clean Rags and Brake Cleaner: To thoroughly clean the sealing surfaces before installing the new seal.
- Thread Locker: For bolts that require it to prevent loosening.
- Gasket Scraper: To remove old gasket material without damaging surfaces.
Where to Buy Parts and Tools
I found that purchasing from specialized Mini Cooper parts suppliers or reputable online retailers gave me the best combination of price and quality. Avoid general auto parts stores for seals unless they have a good return policy and clear fitment information for the 2009 Mini Cooper.
Final Tips from My Experience
- Double-check your Mini Cooper’s engine code and transmission type to ensure you buy the correct rear main seal.
- Consider buying a repair manual or accessing detailed repair guides/videos to understand the disassembly and reassembly process.
- If you don’t have experience with transmission removal, hiring a professional might save you time and potential damage.
- Keep track of all bolts and parts removed, and label them to avoid confusion during reassembly.
By investing in quality parts and tools and preparing thoroughly, repairing the rear main seal on my 2009 Mini Cooper was manageable and saved me from costly engine damage down the road. I hope this buying guide helps you get started on your repair with confidence!
Author Profile
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Michael Shirley is the voice behind sleevetext.com. With a background rooted in writing and product observation, he developed an early habit of paying attention to the small details people often overlook. Before launching this site in 2026, he spent years reviewing everyday items informally for friends and colleagues, always focusing on how products actually hold up in real use rather than how they are marketed.
Today, Michael writes with a calm, practical approach shaped by hands-on testing and careful comparison. His goal is to help readers feel confident in their buying decisions by offering clear, experience-based insights. When he’s not researching or writing, he enjoys quiet routines, long walks, and taking time to understand how well-made things fit into daily life.
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