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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 08-26-2014, 11:57 PM   #1
jburger10
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what kind of leak could this be?!

this is the rear of my 03 e46 m3. looks near transmition. anyone know what this is? it is not dripping and havent seen a spot from a leak at all.. the area is sticky doesnt really feel wet. so if it is a leak its has to be minor? any ideas?


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Old 08-27-2014, 12:00 AM   #2
jburger10
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what kind of leak is this?!

 photo leak_zps2dac2063.jpg

this is towards the rear of my e46 m3 2003..
not dripping not running. no spots on ground.
doesnt feel wet really.. but it looks it and has build up.
im guessing this is from transmition maybe? any ideas thanks!?!
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Old 08-27-2014, 12:53 AM   #3
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Old 08-27-2014, 01:05 AM   #4
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no ideas?
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Old 08-27-2014, 01:11 AM   #5
motorhead55
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It looks like the pinion seal is leaking on the differential. If it has leaked a while then you had better check the oil level. The upper hex plug is where you fill the dif and you fill until it flows out with the car level.

Last edited by motorhead55; 08-27-2014 at 01:14 AM.
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Old 08-27-2014, 01:30 AM   #6
jburger10
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just realized you meant check the differential oil level correct?..
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Old 08-27-2014, 02:04 AM   #7
jburger10
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did alittle research so i could explain better.
checked the differential plugs, fill and empty ports.. checked left and right side just to make sure i wasnmt missing anything or wet spots.
right infront of that is the U-frame "jack point" up under it "front of differential is where it is wet or leaking. any ideas?
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Old 08-27-2014, 02:05 AM   #8
jburger10
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did alittle research so i could explain better.
checked the differential plugs, fill and empty ports.. checked left and right side just to make sure i wasnt missing anything or wet spots.
right infront of that is the U-frame "jack point" up under it "front of differential is where it is wet or leaking. any ideas?
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Old 08-27-2014, 08:35 AM   #9
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Most likely input shaft seal.
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Old 08-27-2014, 10:52 AM   #10
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Quote:
Originally Posted by motorhead55 View Post
It looks like the pinion seal is leaking on the differential.
Quote:
Originally Posted by choxor View Post
Most likely input shaft seal.
Quote:
Originally Posted by jburger10 View Post
"front of differential is where it is wet or leaking. any ideas?
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Old 08-27-2014, 07:27 PM   #11
aznniche
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Common issue with M3's. If it isn't leaking, I wouldn't worry too much.
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