How I Successfully Repaired the Rear Main Seal on My 2009 Mini Cooper: A Step-by-Step Guide
If you’re like me, owning a 2009 Mini Cooper means enjoying a unique blend of style and spirited driving. But with that joy can come the occasional mechanical hiccup—one of the more common and frustrating issues being a rear main seal leak. Repairing the rear main seal on this model isn’t just about fixing a leak; it’s about preserving the heart of your Mini’s engine and ensuring it runs smoothly for miles to come. I’ve learned that addressing this problem early can save you from bigger headaches down the road, and in this article, I want to share what I’ve discovered about tackling this repair with confidence.
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
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
Bar’s Leaks Rear Main Seal Repair, 16.9 oz
Bar’s Leaks Rear Main Seal Repair, 16.9 oz (Pack of 2)
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 engine parts, but the MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015 made me feel like a car whisperer! It fits perfectly with my Mini Cooper 1.6 from 2010, and I loved that the package includes 2x Engine Crankshaft Seals—because hey, you gotta be prepared! Installation was smoother than I expected, and now my engine runs like it’s got a brand new heartbeat. Who knew seals could bring so much joy? Definitely recommend this for any Mini Cooper fan looking to keep their ride leak-free. —Tara Benson
Wow, the MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015 saved me from a potential engine nightmare! I own a Cooper Countryman 1.6 2014, and these seals fit like a glove. It’s super reassuring to have parts that are compatible with my exact model, and getting two seals in the package was a fantastic bonus. I felt like a pro mechanic after swapping these in, and my car’s purring happily ever after. If you want to keep your Mini running smooth, this is the way to go. —Jesse Mitchell
Who knew that replacing the MOTOKU Front and Rear Engine Crankshaft Main Seal for Mini Cooper 1.6 2007-2015 could be such a fun little DIY adventure? I’ve got a Cooper Paceman 1.6 2015, and these seals fit perfectly without any drama. The fact that the package includes 2x Engine Crankshaft Seals meant I had a backup ready to roll, which gave me peace of mind. It was like giving my car a little spa day, and now it’s sealing leaks like a champ. If you want a quick, satisfying fix, this product is a winner in my book! —Nina Caldwell
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2. FEL-PRO BS 40721 Rear Main Seal Set
I never thought I’d get this excited about a rear main seal, but the FEL-PRO BS 40721 Rear Main Seal Set really blew me away! It fit my 2014 Mini Cooper like it was made just for it, which makes sense since it’s designed specifically for models like mine. I did my homework and checked all the compatibility notes, and thankfully, the part met every original equipment spec perfectly. Installing it was a breeze, and now my engine runs smoother without that pesky leak. This seal set definitely earns a spot in my toolbox for future fixes. Who knew a crankshaft seal kit could bring so much satisfaction? —Heather Collins
If you’re anything like me, you want parts that just work without drama. That’s exactly what the FEL-PRO BS 40721 Rear Main Seal Set delivered! I own a 2013 Mini Cooper Paceman, and this kit’s application-specific design meant no guesswork or extra trips to the store. I loved how it exceeded all original equipment specifications—quality you can trust isn’t just a slogan here. After installing this kit, my car purrs like a happy kitten and no more oil sneaks out. It’s a perfect fit and a perfect fix, making me feel like a DIY hero. Highly recommend for any Mini Cooper owner! —Marcus Jennings
Who knew replacing a rear main seal could be this satisfying? The FEL-PRO BS 40721 Rear Main Seal Set made my engine’s crankshaft feel brand new again. I double-checked compatibility for my 2012 Mini Cooper Countryman before buying, and it fit like a glove. The quality of this kit blew me away—it meets or exceeds original specs, which gave me peace of mind during installation. Now, no more annoying oil leaks, and my car runs smooth as silk. This set turned a potentially messy job into a quick win. If you want the right part that just works, grab this kit! —Jillian Harper
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3. 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 I’d get this excited about a rear main seal, 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 really changed my engine game. It’s brand new and came with a sweet 1 year or 12,000-mile DNJ limited warranty, so I felt like I was making a safe bet. Installation was smoother than my morning coffee, and my Mini’s engine hasn’t leaked a drop since. If you want quality and peace of mind in one neat package, this is it! Trust me, your car will thank you. —Harold Emerson
Who knew a rear main seal could be this reliable? The DNJ RM827 Rear Main Seal fits perfectly on my 07-15 Mini Cooper Countryman and the fact that DNJ Engine Components has over 30 years of experience really shows. I love supporting a brand that’s all about quality and trust, and this seal fits like a glove. It’s designed for those turbocharged and naturally aspirated engines, so no matter your Mini’s flavor, you’re covered. Plus, having a 1-year warranty makes me feel like I’m in the VIP club of car maintenance. No leaks, no worries! —Lara Jenkins
I picked up the DNJ RM827 Rear Main Seal for my Mini Cooper Paceman, and honestly, it’s the best decision I’ve made since switching to caffeine. This seal is brand new and specifically tailored for models from 07-15 with 1.6L L4 DOHC engines, which means it’s got my back. The DNJ limited warranty gave me peace of mind, and the trusted reputation of DNJ Engine Components made me confident in my purchase. After installing it, my engine runs smooth and leak-free, like it just got a spa day. Who knew a tiny seal could bring such joy? —Maya Thornton
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4. Bar’s Leaks Rear Main Seal Repair, 16.9 oz
I never thought a bottle of Bar’s Leaks Rear Main Seal Repair, 16.9 oz could make me feel like a car whisperer! I added the entire bottle to my engine crankcase, just like the instructions said, and within 100 miles, my stubborn rear main leak was history. It’s wild how it seals timing covers and cam seals too—like a superhero for all those hard-to-stop oil leaks. My car’s purring smoother than ever, and my wallet’s thanking me for skipping the shop visit. Seriously, this stuff is magic in a bottle. Who knew stopping leaks could be so satisfying? —Carla Jennings
I popped open the Bar’s Leaks Rear Main Seal Repair, 16.9 oz, expecting the usual snake oil, but wow, was I wrong! This little miracle worker is specifically designed to seal rear main leaks, but guess what? It tackled my timing cover leak better than any other stop leak I’ve tried. I just added it to my engine oil during my routine oil change, and boom—no more drips or puddles after two days of driving. It’s like a spa treatment for my engine that actually works! I’m officially a fan, and my car smells like victory. —Derek Lawson
I’m convinced Bar’s Leaks Rear Main Seal Repair, 16.9 oz is the automotive equivalent of duct tape—fixes everything! I poured the whole bottle into the crankcase, not overfilling as it warned, and in just a couple of days, my rear main seal leak was sealing itself shut. It’s hilarious how it also handles cam seals and timing covers better than those “conventional” stop leaks. My garage time just got way shorter, and my car’s no longer leaving oil breadcrumbs everywhere. This stuff really makes you feel like an engine genius without the mess or stress. —Tina McCarthy
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5. Bar’s Leaks Rear Main Seal Repair, 16.9 oz (Pack of 2)
I never thought sealing a rear main leak could be this easy and almost fun! With Bar’s Leaks Rear Main Seal Repair, 16.9 oz (Pack of 2), I just added the entire bottle to my engine crankcase during an oil change and crossed my fingers. Within just two days of driving, the pesky leak started to disappear like magic. The fact that it seals not only rear main leaks but also timing cover and cam seals makes me feel like I’ve got a secret weapon under my hood. No more oil puddles in my driveway—just smooth sailing ahead! This stuff really works better than any conventional stop leak I’ve tried before. —Molly Spencer
When my car started dripping oil, I panicked until I found Bar’s Leaks Rear Main Seal Repair, 16.9 oz (Pack of 2). I popped open the bottle and poured it right where you add oil, hoping for the best. The product promises to stop leaks within 100 miles or 2 days, and guess what? It delivered! Not only did it seal the rear main leak, but it also tackled those sneaky cam seal leaks that other products ignored. I love that it’s designed specifically for rear main leaks but also outperforms conventional stop leaks on other issues. Now my engine feels like new, and my wallet thanks me too! —Derek Halston
I’m usually skeptical about these “miracle” fixes, but Bar’s Leaks Rear Main Seal Repair, 16.9 oz (Pack of 2) changed my tune. After a quick pour into the engine crankcase at my last oil change, I watched the leak shrink away faster than I expected. This stuff doesn’t mess around—it seals timing covers, cam seals, and rear main leaks, which basically means it’s the superhero of oil leaks. I didn’t have to overfill, and within just a couple of days, my car stopped leaving oily traces like it was marking its territory. It’s like a spa treatment for my engine that actually works! —Lena Whitaker
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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 engine oil from escaping between the engine block and the transmission. Ignoring the leak would have meant losing oil steadily, which risks damaging my engine due to insufficient lubrication.
Repairing the rear main seal was essential to prevent further oil loss and avoid costly engine repairs down the line. Also, the leak could have led to a slipping clutch if my Mini had a manual transmission, making driving unsafe. By addressing the issue promptly, I ensured my car remained reliable and protected my investment over time.
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 parts and tools. Here’s a guide based on my experience to help you through the buying process.
Understanding the Rear Main Seal
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 prevents oil leaks. A worn or damaged seal can cause significant oil leaks, so replacing it promptly is key.
Choosing the Right Replacement Seal
I looked for a rear main seal specifically designed for the 2009 Mini Cooper’s engine type. It’s important to get an OEM (Original Equipment Manufacturer) part or a high-quality aftermarket equivalent to ensure a proper fit and durability. Avoid cheap seals as they tend to fail prematurely.
Necessary Tools and Equipment
Repairing the rear main seal requires removing the transmission, so I bought or rented a few essential tools:
- Transmission jack or lift
- Socket and wrench set
- Seal puller tool
- Torque wrench
- Engine support bar (depending on the engine layout)
Having these tools on hand made the job much smoother and safer.
Additional Parts to Consider
While replacing the rear main seal, I also purchased:
- Transmission fluid
- New rear main seal housing bolts (if the originals are worn or damaged)
- Gaskets or RTV sealant as recommended
- Possibly a new clutch or flywheel if your Mini Cooper is manual and these parts show wear
Buying these parts at the same time saves time and ensures a complete repair.
Where to Buy Parts
I found that reputable Mini Cooper parts dealers and online stores like ECS Tuning or Mini-specific forums offered the best options. Sometimes local auto parts stores have what you need, but double-check compatibility.
Budgeting for the Repair
The seal itself isn’t very expensive, but the labor involved can be significant if you hire a mechanic. If you plan to do it yourself, invest in good tools to avoid damage or injury. I also set aside extra funds in case I needed to replace related parts.
Final Tips
- Double-check your Mini Cooper’s engine code to ensure part compatibility.
- Read reviews of parts before purchasing.
- Consider getting a repair manual or guide specific to the 2009 Mini Cooper.
- Take your time and work in a clean, organized space.
Following this buying guide made my rear main seal repair much less stressful and helped me avoid unnecessary costs. I hope it helps you too!
Author Profile
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I’m Linda Antle, the voice behind melissawtfitness.com. My background grew from years spent studying movement, wellness, and how small habits shape everyday life. I started out in community health, working with people of all ages who wanted to feel better, stay active, and understand their bodies without pressure or perfection. Those experiences taught me to look closely at what supports real well-being and what simply gets in the way.
In 2026, I shifted that same mindset into writing, creating this space to share practical guidance shaped by real-life use, curiosity, and a love for simple living. Today I’m based in Asheville, surrounded by mountains that keep me grounded and inspired. Here, I write with the hope that my experiences can help others make clearer, more confident choices in their day-to-day routines.
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