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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 01-11-2014, 12:41 PM
fernando152010 fernando152010 is offline
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Unhappy Did oil change and saw this gunk inside. What exactly is it? Is it a bad problem?

Hey guys I was doing my first oil change on my 07 335 xi since I bought it 5 months ago and I saw sludge inside all over and on the cap. Does anyone know what it is? and how can I clean it. I think it is because BMW oil rule of once a year is just crap so I will never go over 7000 miles on the oil again. Need help and advice
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  #2  
Old 01-11-2014, 01:08 PM
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fun2drive fun2drive is offline
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That is sludge which is pretty uncommon with synthetic oil. Lot of short drives and engine not fully warmed up contribute to that. If it is only around the fill cap no issues because that is about the highest point in the engine some oil and fumes accumulate there.
If it looked like mocha it would be much more normal especially in the winter...
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  #3  
Old 01-11-2014, 02:20 PM
ptrcd003 ptrcd003 is offline
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Quote:
Originally Posted by fernando152010 View Post
I think it is because BMW oil rule of once a year is just crap so I will never go over 7000 miles on the oil again. Need help and advice
So you randomly came up with it being caused by the 1-year oil change interval, and came up with a random number of miles to do future oil changes? By your logic, all BMWs would have that sludge under the oil cap.
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  #4  
Old 01-11-2014, 02:44 PM
grijo grijo is online now
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You do not know what oil the previous owner used. Going forward used the BMW recommended oil, and change it every 7K miles. Hoping that over time the premium oil should clean your engine.
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Last edited by grijo; 01-12-2014 at 05:55 AM.
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  #5  
Old 01-11-2014, 03:35 PM
alpinweiss alpinweiss is offline
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Assuming you do not have a complete maintenance history on the car, you may wish to do a couple of short interval oil changes, perhaps every 3000 miles for the first two changes. This might clean some of the sludge out. Then revert to a more reasonable interval, maybe every 5000 to 7000 miles.

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  #6  
Old 01-11-2014, 04:00 PM
Miller335 Miller335 is offline
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Originally Posted by alpinweiss View Post
Assuming you do not have a complete maintenance history on the car, you may wish to do a couple of short interval oil changes, perhaps every 3000 miles for the first two changes. This might clean some of the sludge out. Then revert to a more reasonable interval, maybe every 5000 to 7000 miles.

Exactly what I would do.
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  #7  
Old 01-11-2014, 04:10 PM
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SilverX3 SilverX3 is offline
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+1

I do every 8000km or 12 months whatever comes first
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  #8  
Old 01-11-2014, 05:24 PM
Watchme Watchme is online now
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I wouldn't worry about, just clean and good to go. That's very top of the valve cover, any foam bubbles up there, like a soup lid.
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  #9  
Old 01-11-2014, 09:33 PM
Pilgrim Pilgrim is offline
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IMO the previous owner has been using the wrong oil, or not changing at correct intervals. They may also have been driving a lot of short in-town trips. You should NOT be seeing that. Period.

I would make darn sure to do a few early oil changes - at no more than 5K intervals - and put some good long-trip driving on that engine. You need to let the synthetic oil work and clean it up.
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  #10  
Old 01-12-2014, 06:21 AM
335i Driver 335i Driver is offline
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Did you see that when you bought the car? I'd be surprised if any LL01 oil would do that even at extended drain intervals. My guess is long intervals on the wrong oil. Like someone else suggested do a couple of short intervals and use Pennzoil Ultra Euro 5-40. LL01 and there is no oil you can buy anywhere that does a better job of cleaning an engine.
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  #11  
Old 01-18-2014, 02:44 PM
fernando152010 fernando152010 is offline
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Ok I will do a couple short term oil changes and defendant lot use the right oil. Dies any one use Mobil one 0w-40 European formula?
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  #12  
Old 01-18-2014, 08:32 PM
alpinweiss alpinweiss is offline
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I really like the Mobil-1 0W-40 European Formula. But the price of it has increased significantly, so I can actually buy the BMW Synthetic oil from the BMW dealer for less money.

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  #13  
Old 01-19-2014, 09:10 AM
Phil325i Phil325i is offline
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Don't want to worry you OP, but the sludge might not be limited to the filler cap...

http://blog.bavauto.com/8476/bmw-and...nge-intervals/
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  #14  
Old 01-19-2014, 09:30 AM
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beden1 beden1 is offline
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Quote:
Originally Posted by Phil325i View Post
Don't want to worry you OP, but the sludge might not be limited to the filler cap...

http://blog.bavauto.com/8476/bmw-and...nge-intervals/
I agree. I still change the oil in all of our cars every 3-4,500 miles, depending on whether synthetic oil is used of not. I also make sure that all of our vehicles get needed time on the highway and mixed with spirited driving in order to keep everything working properly.
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Old 01-19-2014, 09:33 AM
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Keepittrill Keepittrill is offline
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Originally Posted by beden1 View Post
I agree. I still change the oil in all of our cars every 3-4,500 miles, depending on whether synthetic oil is used of not. I also make sure that all of our vehicles get needed time on the highway and mixed with spirited driving in order to keep everything working properly.
Do you pay for it yourself or do you force BMW to do it?


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Old 01-19-2014, 11:33 AM
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beden1 beden1 is offline
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Do you pay for it yourself or do you force BMW to do it?


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BMW gives us one free oil change per year and I pay for the rest. My son drives the M3 about 12,000 miles per year so we pay for 2+ oil changes and BMW pays for one, for example.
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Last edited by beden1; 01-19-2014 at 11:35 AM.
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  #17  
Old 01-19-2014, 12:39 PM
Greyfox Greyfox is offline
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If you are changing the oil, make sure the car is at operating temperature before you drain the oil. I know it's a pain in the arse, but letting an engine warm up and fully circulate the oil and then dumping it out will keep some of the gunk build up suspended in the oil and will flush it out.

Also, I've been known to pour a quart of fresh clean oil right through the engine into the oil catch pan just to pick up any little bits that might be hanging around somewhere.
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  #18  
Old 01-19-2014, 02:47 PM
aleks001 aleks001 is offline
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Originally Posted by fernando152010 View Post
Ok I will do a couple short term oil changes and defendant lot use the right oil. Dies any one use Mobil one 0w-40 European formula?
Why not do an engine flush, there are plenty of those products around, where you add an additive to your oil, drive for 500 or so miles and then do a flush.
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  #19  
Old 01-19-2014, 02:57 PM
Greyfox Greyfox is offline
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Some of those degreaser/degunk products will not only clear out the gunk, but will eat seals.
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  #20  
Old 01-19-2014, 03:08 PM
aleks001 aleks001 is offline
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Some of those degreaser/degunk products will not only clear out the gunk, but will eat seals.
I'm sure you can find a product that works properly and is safe to use.
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  #21  
Old 01-19-2014, 03:16 PM
Greyfox Greyfox is offline
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Originally Posted by aleks001 View Post
I'm sure you can find a product that works properly and is safe to use.
It's your engine...
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  #22  
Old 01-19-2014, 07:35 PM
mars5887 mars5887 is online now
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This is the result of it building up. I wish I had went to shorter oil changes when I noticed it starting.

This is 106000:

http://mars58superstinker.wordpress....idays-and-bmw/

Last edited by mars5887; 01-19-2014 at 07:36 PM.
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  #23  
Old 01-19-2014, 08:32 PM
ptrcd003 ptrcd003 is offline
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But what is it that causes sludge buildup on some engines? Some people are blaming the oil change intervals, but then why aren't all cars affected? Just for contrast, this is my old E46 at 177K miles, having BMW recommended oil changes its whole life.
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  #24  
Old 01-27-2014, 07:16 AM
mars5887 mars5887 is online now
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One thing I noticed after oil change and valve cover replace. I was at full oil, drove the car about an hour. Oil was same. Next day drove car hour to work, down a quart of oil. Figured I had a leak. Got home everything was dry. Put another quart in and oil has been full ever since. I can only surmise that the plastic VC sucked up a quart of oil. Now if there really is that much oil up there, then that is going to turn to gel/sludge etc... Just a guess.
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