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      10-29-2009, 12:34 PM   #1
voltron1011
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Oil leak. rear main or pan?

So my car is at 59000 miles and it appears to be leaking somewhere around the pan area, although I didn't see any oil from the pan itself.
I've been reading that the rear main seal may have been incorrectly installed on early E90s (like mine).
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      10-29-2009, 01:13 PM   #2
voltron1011
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BTW, my car is out of warranty. If this is pretty common issue, do anyone think that the dealership may work with me on the price to fix it?
I need it fixed soon, because I'm getting ready to transfer back to Germany and this car is going on a ship in about 3 weeks.
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      10-29-2009, 08:53 PM   #3
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maybe the head gasket?
try to get them to goodwill it!
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      10-29-2009, 09:52 PM   #4
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if it was head gasket it would probably leak into your coolant and you would get milky coolant. I would start with loose valve covers. If it's not that, clean the pan and look for leaks...
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      10-29-2009, 10:07 PM   #5
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i had a bad rear main go bad at 25k. on our cars its pretty hard to tell whether its the pan of the rear main since the oil will both can leak form the same place. Fortunately i was under the warranty and the dealer first replaced my pan gasket. When that didn't fix it the replaced the rear main. Best thing i can say is clean it first, and make sure it is only coming from the bottom of the motor. If it coming form higher up neither of these is your problem
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      10-29-2009, 10:25 PM   #6
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Hope its not your rear main, that requires dropping the transmission and it aint cheap. I was quoted $800 to do it on my 540i.
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      10-29-2009, 10:52 PM   #7
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Yeah, you better hope its not the rear main seal, because it will run you 1000+ with labor...unless of course you want to do it yourself.
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      10-30-2009, 08:51 AM   #8
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How certain are you that it's motor oil and not tranny fluid? There was a recall on the mechtronic(sp?) sleeve which could be leaking tranny fuid.
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      10-30-2009, 11:09 AM   #9
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Quote:
Originally Posted by Socom View Post
How certain are you that it's motor oil and not tranny fluid? There was a recall on the mechtronic(sp?) sleeve which could be leaking tranny fuid.
It's a 6spd manual, so I don't think it has a mechatronic?
I just got a quote from a local shop (PPR Automotive) for $500 for oil pan, or $900 for the main seal.
I'm taking it in on Monday to get it done, no matter what the cost is. I'd rather pay $500 to $900 than 500 to 900 Euros once I get to Germany.
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      10-30-2009, 11:14 AM   #10
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$500 for an oil pan gasket seems way out of line. $900 for a rear main, yes, $500 for a pan gasket r&r, no freaking way.
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      10-30-2009, 12:08 PM   #11
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Quote:
Originally Posted by Tee-Dub View Post
$500 for an oil pan gasket seems way out of line. $900 for a rear main, yes, $500 for a pan gasket r&r, no freaking way.
From what I've researched in the TIS, the oil pan gasket is not a very simple job either. You have to disconnect the exhaust, raise the engine, drop part of the front suspension, and remove motor mounts.
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      10-30-2009, 12:50 PM   #12
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Quote:
Originally Posted by Socom View Post
How certain are you that it's motor oil and not tranny fluid? There was a recall on the mechtronic(sp?) sleeve which could be leaking tranny fuid.
+1 I had mine replaced because of leaking. I actually thought it was oil at first too.
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      10-30-2009, 03:24 PM   #13
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Quote:
Originally Posted by raceyBMW View Post
+1 I had mine replaced because of leaking. I actually thought it was oil at first too.
Steptronic?
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      10-30-2009, 03:59 PM   #14
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I had a similar problem with my 06 e90 330xi 6mt. Took them a while to find it, but in the end it was the rear main seal. To give you an idea how bad mine was a year into owning it I got a low oil light. threw in a quart and a week later is was back so I went in. They had the gall to tell me this was normal, filled it up and sent me out with a spare quart. 1 week later I was back down a quart. This went on three separate times before they found the problem.
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      10-30-2009, 07:45 PM   #15
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Quote:
Originally Posted by voltron1011 View Post
Steptronic?
Yes, you are 6MT, so disregard what I said.
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      11-03-2009, 11:09 AM   #16
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*UPDATE*
PPR Automotive called and told me that the leak was actually from the front seal. So, the repair is only $400 now. WHEW!!!
I never really hear of a front seal going bad?
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      11-03-2009, 11:55 AM   #17
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Quote:
Originally Posted by wasup1357 View Post
maybe the head gasket?
try to get them to goodwill it!
You'll notice either white smoke from coolant dumping on your pistons or milky oil from coolant mixing in the oil. It's pretty unlikely that the outter section of a head gasket blows. Eh who knows.

If it's near your oil pan I'de think maybe an oil pan gasket or rear main seal. Are you sure it's engine oil and not tranny fluid or some kind of other fluid?

*edit* nvm all questions were previously asked :/
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      11-03-2009, 04:22 PM   #18
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I had this scare with my E46 M3, after much fretting and searching I determined it was the CPV (constant pressure valve). Its a pressure valve screwed into the block. Check that out before you replace any seals.
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      11-28-2009, 02:45 AM   #19
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      03-19-2011, 07:30 PM   #20
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Do the '07 335i's have the issue with incorrectly installed rear mains as well? I just hit about 65k, and I came home from a week of work out of state to a 6ft drip of tranny fluid.

Looked underneath and its ONLY around the rear of the pan, the front looks dry (though it was parked on a slight incline). I also didnt notice any spray by the back of the tranny. It was dripping off of the pan bolts.....

any similarities? mines an A6 though... fml
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      03-19-2011, 08:03 PM   #21
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Had the mechatronics sleeve replaced on my 07 335i a few weeks ago. Never had a chance to put it up on the lift and see where the actual leak was though. Oil pooled towards the rear of the motor.
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      03-20-2011, 09:17 AM   #22
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Quote:
Originally Posted by firechicken99 View Post
Do the '07 335i's have the issue with incorrectly installed rear mains as well? I just hit about 65k, and I came home from a week of work out of state to a 6ft drip of tranny fluid.

Looked underneath and its ONLY around the rear of the pan, the front looks dry (though it was parked on a slight incline). I also didnt notice any spray by the back of the tranny. It was dripping off of the pan bolts.....

any similarities? mines an A6 though... fml
Problem is any wind/fan air relocates the oil, so it's a PITA to narrow down where it comes from sometimes.

My truck dumped a bunch of oil in my garage. Looking under it, I was 95% sure it was the rear seal of the motor. Turns out the dipstick tube rode out of the block, and it was leaking from there (totally unrelated area)....
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