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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Oct-07-2010, 04:01:45 AM   #11
chraostech
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car has exactly 75K as of today....previous owner replaced the diff fluid at 72K with Redline fluid..which from reading around forums I am guessing is not the way to go. tomorrow morning i am going to get a good flashlight and try to take a pic and post what it looks like under there
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Old Thu, Oct-07-2010, 03:27:24 PM   #12
RedM3/4
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Default Here's the thought, again, a bit of a longshot

The redline may, even at the same/proper oil weight rating, be slightly "thinner" than stock. I know some folks get new tranny leaks with D4ATF in E36M's.
You could drain just a bit, half quart to quart, replace with mineral spirits. Drive moderately for 50 miles or until you get some bad noise or behavior (not too likely if you take it easy). Then drain it well, like an hour or so, and refill with OE fluid.

Idea is to get the seal as clean as possible. When you do this, a leak is likely to get a bit worse for a bit, since this mixture is even thinner. The Redline has possibly already done some of that. Then, when you put in the fresh OE fluid, it gets to the seals to condition and swell them, and may be just thicker enough to slow and finally stop the leak, especially since you have only a slow "weep", versus a dripping leak. It is unlikely, but this could make the leak worse, so this is all at your own risk.

I've seen a similar process help in older engines. But do NOT use mineral spirits in an engine.

Now, we all like to fret over our cars, but me, personally, I would never take apart a pinion that wasn't leaking enough to leave drops on the garage floor, same for a half-shaft, many of them seem to weep a bit. So another option is to wipe off the worst from time to time and do nothing but monitor it. I don't believe this can have anything to do with the noise you mentioned supposing you check the diff fluid level and it is full or only an ounce or two down.

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Originally Posted by chraostech View Post
car has exactly 75K as of today....previous owner replaced the diff fluid at 72K with Redline fluid..which from reading around forums I am guessing is not the way to go. tomorrow morning i am going to get a good flashlight and try to take a pic and post what it looks like under there
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Discussing differential pinon seal leak in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)