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post #1 of 12 Old 12th February 2017, 05:40 AM Thread Starter
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Extremely Sludgey Oil?

So, this is the first oil change I've done on this car since I've bought it - put far fewer miles on it than I expected to by this point due to an extended stay at the dealership. So, last oil change was probably at least 5 months ago, probably ~4000 miles. Maybe close to 4500.

I've changed oil in lots of motorized things in my life, and I generally know what looks good and what looks bad. This looked pretty bad. It's about as dirty and sludge-like as oil can possibly be while still looking like oil, IMO. Even my friend who helped me out said in all his years of owning BMWs and other performance cars, this is the worst-looking oil he's seen. Pretty much looked like mud and chocolate syrup mixed together. No metallic particles or any other foreign matter though.

Carly confirmed that the car has now had 13 oil changes (including this one) over its ~79,500 miles, which seems fine. Previous owner made a point of doing it every 3500 miles or as close to that as possible, never used anything but the OEM oil change kit. So I'm wondering how it could have possibly looked so bad coming out. Given the delicacy of the rod bearings and VANOS, I'm a bit concerned.

Oil is getting sent to Blackstone, so will be interesting to see what they say. Is this normal? Is it supposed to look this dirty? This is the first time I've specifically done an oil change on an S85 car, but I've never seen oil look like this before...only thing that came close was a heavily abused Briggs & Stratton-powered Sears lawnmower after lots of abuse and neglect...


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post #2 of 12 Old 12th February 2017, 05:50 AM
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Dirty yes, slude like no. Was it wa when draining??

Fyi ive changed my oil after 4000km and it does looks black!

I think in 16000km since ive had mine its had over 5 changes

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post #3 of 12 Old 12th February 2017, 06:01 AM Thread Starter
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It seemed just a bit thick, can't say it actually had the consistency of sludge but it the coloring was quite bad, I thought. It had this "muddy" quality which I'm used to seeing when the oil has gotten seriously dirty. Seemed ok when draining but it was only traveling a small distance.

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post #4 of 12 Old 12th February 2017, 10:49 AM
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I change oil every 5k kms and it is always dark brownish in colour. Sort of like milk chocolate. Not dark chocolate.

Your description seems to suggest the oil had not been changed for a long time.
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post #5 of 12 Old 12th February 2017, 02:32 PM
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Do a bunch of short interval oil changes like literally 500miles change it 500 change it 500 change it and use shell Rotella t6 it has a lot of detergents since it's designed for diesels and many people use it with great reviews and would even go as far to say better or at least equally as good as oem.

But to your issue I highly recommend not using any additives and just do a bunch of short interval changes. The first change or 2 if your engines really bad you can even go ahead and do the oil change after a couple hundred miles. This will clean the motor up really good.

I do this to all my cars when I first get it before going on to doing a 3 to 4k routine chsnges and it makes a huge difference using the right oil with detergents will clean your internals safely and effectively. Also shell Rotella t6 is cheap and can be found at Walmart so it doesn't cost too much to do a bunch of changes.

Once you find the oil coming out clean after several short changes you can switch back to oem fluid if you prefer or a higher grade Ester based fluid such as motul. Which is what I usually run. After using the t6 to clean the motor. Or continue using the T6 if your on a budget it's a very good oil to be used routinely if your wanting to save a few bucks without sacrificing on quality.

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post #6 of 12 Old 12th February 2017, 03:32 PM
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Based on the words sludge, muddy, mud and chocolate syrup mixed together...

Isn't a chocolate milk like colour, along with sludge-ey consistency indicative of coolant in the oil? I'm sorry if this scares a bit - not my intention. It's just one of the signs to look for a head gasket issue in the E39s. Maybe a quick video of some of the oil being poured from one container to another might help with understanding what is being described.

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post #7 of 12 Old 12th February 2017, 03:39 PM
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Sounds like non recommended oil was being used. Either the owner was "told" that they used recommended oil and yet something else was poured in. Or he is not telling you the truth. Lets see what Blackstone says. The worst is when they said they changed oil but they didn't. That leads to thick sludgy oil.

The components found in the oil will be the fingerprint that will tell you what is up. Unless you have a coolant leak internal to the engine. That makes for really nasty oil, but it almost looks foamy white.

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post #8 of 12 Old 12th February 2017, 05:21 PM Thread Starter
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Thanks for all the replies. Truly appreciate it. Unfortunately it was done late at night in a driveway, I totally forgot to take pics/video until it was too late. I am struggling to describe the color properly. I'm used to oil coming out quite dark, but still looking like oil. Almost black. This was much lighter in color, almost like muddy clay. Maybe it was just the angle of the lights we were using, not sure. Just much lighter and less transparent than I'm used to. Might be over-reacting

Like someone said, it seemed exactly like what you would expect if hadn't been changed in something like 15k miles. But I doubt that was the case. Either way, will have to wait for Blackstone analysis, hopefully that provides some answers. At least there was nothing metallic in it.

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post #9 of 12 Old 12th February 2017, 08:04 PM
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Originally Posted by Derived View Post
Carly confirmed that the car has now had 13 oil changes (including this one) over its ~79,500 miles, which seems fine.
Where in Carly are you getting this information?

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post #10 of 12 Old 13th February 2017, 05:17 AM
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