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      07-20-2018, 01:05 PM   #23
Billfitz
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Quote:
Originally Posted by Polo08816 View Post
The chances of an engine seizing due to "sludge" is rare.
I've seen it. Guy had his Pontiac towed into the shop, the mechanic dropped the pan, and there was some four or five inches of congealed goo in the pan. It turned out the car had over 100k on it, the oil and filter had never been changed, and this was back in the days of mineral oil. That's how badly a car must be treated for sludge to cause the engine to seize.
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      07-20-2018, 01:22 PM   #24
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Dang that sucks. Only a 2014 to...
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      07-20-2018, 01:22 PM   #25
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With synthetic oil, the oil cannot break down to create what is commonly called engine sludge. I believe making sludge starts out by making an emulsion of an oil-type product and water-based things like condensation. (The process is similar to making mayonnaise.) The emulsion traps debris and creates the goo. Synthetic oil doesn't do that.
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      07-20-2018, 02:48 PM   #26
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Something is seriously amiss in this diagnosis. If the normal oil and filters changes were done, there is absolutely no friggin way there was a "sludge" build up of any magnitude- probably none. I've got 101,290 when I pulled the pan recently- nada, zilch, zippo.

I wonder exactly what the service department is calling "sludge"? Is it full of metal filings, etc. You need to find out/get another opinion.
This smells.
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      07-21-2018, 09:14 PM   #27
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If you are in Atlanta and looking for a good independent then I recommend Harrison Motorsport in Alpharetta. Shop has been there 15+ years. The run the local BMWCCA and do a good bit of racing themselves. https://www.harrisonmotorsports.com
Sludge at 25k seems unusual. I would get a second opinion.
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      07-23-2018, 07:07 AM   #28
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Quote:
Originally Posted by rak299 View Post
With synthetic oil, the oil cannot break down to create what is commonly called engine sludge. I believe making sludge starts out by making an emulsion of an oil-type product and water-based things like condensation. (The process is similar to making mayonnaise.) The emulsion traps debris and creates the goo. Synthetic oil doesn't do that.
This is factually incorrect. Synthetic oil breaks down and sludges too-be mindful of the fact that there are varying degrees of quality in synthetic oil. Also one thing to keep in mind is that mileage is merely a standard by which we track usage in a vehicle and isn't a true measure of use of said vehicle. Sitting in traffic for long periods of time in metro areas doesn't increase the mileage but the vehicle still is running for longer periods of time thus adding to the breakdown of oil at a different rate than traveling at highway speeds. Ive seen plenty of sludge in engines with less miles than anyone would think so I wouldn't rule out that it added to the internal engine issues.
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      07-23-2018, 08:57 AM   #29
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Wonder if you snapped a cam...
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      07-23-2018, 11:51 AM   #30
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Quote:
Originally Posted by GMWNashville View Post
This is factually incorrect. Synthetic oil breaks down and sludges too-be mindful of the fact that there are varying degrees of quality in synthetic oil. Also one thing to keep in mind is that mileage is merely a standard by which we track usage in a vehicle and isn't a true measure of use of said vehicle. Sitting in traffic for long periods of time in metro areas doesn't increase the mileage but the vehicle still is running for longer periods of time thus adding to the breakdown of oil at a different rate than traveling at highway speeds. Ive seen plenty of sludge in engines with less miles than anyone would think so I wouldn't rule out that it added to the internal engine issues.
That's why I think there should be engine run time counters as well as lifetime fuel consumption counters in all cars. Fuel consumption counters would show how hard the car was driven relative to the number of miles on the odometer. The engine run time would show if the car was idled excessively.

It is obviously easily implemented, but I suppose there is little reason for manufacturers to put in a feature that would contribute even more to depreciation.
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