340i Differential Leak

Slow330 · 01-19-2022, 05:59 PM

so i recently got my car back from bmw service for a leak that i noticed on my differential, can anyone explain in simpler terms what they did? Is this a common thing?

PeterWT · 01-19-2022, 06:02 PM

The pinion seal was leaking, so they replaced it. Everything else on the list is just things they needed to do in order to do that.

Slow330 · 01-19-2022, 06:03 PM

Quote:

Originally Posted by PeterWT

The pinion seal was leaking, so they replaced it. Everything else on the list is just things they needed to do in order to do that.

Thanks for clarifying

ishowerinjager · 01-19-2022, 07:05 PM

I recently had them tell me the same thing. Quoted me 1300 CAN for the job.

Is that reasonable?

Slow330 · 01-19-2022, 07:08 PM

Quote:

Originally Posted by ishowerinjager

I recently had them tell me the same thing. Quoted me 1300 CAN for the job.

Is that reasonable?

Honestly im not sure since everything was done under warranty for me

cfm56d7b · 01-20-2022, 12:20 AM

Quote:

Originally Posted by Slow330

so i recently got my car back from bmw service for a leak that i noticed on my differential, can anyone explain in simpler terms what they did? Is this a common thing?

How many miles does your car have?

Slow330 · 01-20-2022, 12:21 AM

Quote:

Originally Posted by cfm56d7b

Quote:

Originally Posted by Slow330

so i recently got my car back from bmw service for a leak that i noticed on my differential, can anyone explain in simpler terms what they did? Is this a common thing?

How many miles does your car have?

44k was never tuned or abused

G.Newt · 01-20-2022, 06:58 PM

My passenger side rear diff was leaking under warranty. About 5-10k miles later, the driver side leaks but I was out of warranty. I ordered the new seal and collar nut for about $50 and had a shop do the repair. I paid about $400 for them to replace the seal and drain/fill with diff fluid.

ishowerinjager · 01-22-2022, 09:41 PM

Quote:

Originally Posted by G.Newt

My passenger side rear diff was leaking under warranty. About 5-10k miles later, the driver side leaks but I was out of warranty. I ordered the new seal and collar nut for about $50 and had a shop do the repair. I paid about $400 for them to replace the seal and drain/fill with diff fluid.

Thanks for the details.

I currently have about 100,000km on the car so I'm no longer under warranty.

I will likely try and find a smaller shop to do the repair for a better price

co_440i · 03-28-2024, 12:04 PM

Quote:

Originally Posted by ishowerinjager

Thanks for the details.

I currently have about 100,000km on the car so I'm no longer under warranty.

I will likely try and find a smaller shop to do the repair for a better price

Did you get a solution for this? I was notified last Friday that my front diff pinion seal was leaking and quoted me over $700 for the fix, including a fluid drain and replace. The parts are not expensive and I'd much prefer to do it myself.

G.Newt · 03-28-2024, 01:38 PM

Quote:

Originally Posted by co_440i

Did you get a solution for this? I was notified last Friday that my front diff pinion seal was leaking and quoted me over $700 for the fix, including a fluid drain and replace. The parts are not expensive and I'd much prefer to do it myself.

Paddock did mine. They're in Denver. Autosport Werks in Broomfield also do good work and they're relatively affordable. But yeah, you just need the seal and the fluid.

01-19-2022, 05:59 PM	#1
Slow330 Private 3 Rep 60 Posts Drives: Bmw 330i Join Date: Apr 2021 Location: NY iTrader: (0)	so i recently got my car back from bmw service for a leak that i noticed on my differential, can anyone explain in simpler terms what they did? Is this a common thing? Attached Images
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01-19-2022, 06:02 PM	#2
PeterWT Lieutenant 253 Rep 558 Posts Drives: '17 M240i, AT, BSM Join Date: Dec 2016 Location: Florida, USA iTrader: (0)	The pinion seal was leaking, so they replaced it. Everything else on the list is just things they needed to do in order to do that. __________________ My 2017 M240i: MHD, xHP, Modded OE Intake, AA GESi 400 CPSI Cat DP, Dinan Mid-pipe, M Performance LSD & Rear Diffuser, BMS Exhaust Tips, Apex EC-7 Wheels, M-Tech Front Lip, iND Painted Mirror Caps, Smoked Reflectors
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01-19-2022, 07:05 PM	#4
ishowerinjager Second Lieutenant 111 Rep 216 Posts Drives: 2017 340i M Performance Editio Join Date: Mar 2017 Location: Edmonton iTrader: (0)	I recently had them tell me the same thing. Quoted me 1300 CAN for the job. Is that reasonable? __________________ 2017 340i M Performance Edition: Fashion Grey, MPPSK, M performance front splitter, rear diffuser, side sills, black grille, CF spoiler, 405M 20s, 8AT, full Marino interior and dash, adaptive suspension
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01-20-2022, 06:58 PM	#8
G.Newt Major 811 Rep 1,452 Posts Drives: CT4-V Blackwing 6MT Join Date: Feb 2017 Location: CO -> TX iTrader: (0)	My passenger side rear diff was leaking under warranty. About 5-10k miles later, the driver side leaks but I was out of warranty. I ordered the new seal and collar nut for about $50 and had a shop do the repair. I paid about $400 for them to replace the seal and drain/fill with diff fluid. __________________ 2022 CT4-V Blackwing 6-speed SOLD: 2016 340i xDrive 6-speed DAW v2.5 turbo E40 \| Dorch S2 \| VRSF DP \| MST intake \| AWE catback \| 335is clutch \| CSF heat exchanger \| RK Autowerks intake manifold \| Orange M Perf Brake Kit \| KW Street Comfort coilovers \| GTS taillights V2
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