Oil change is draining old oil and putting new oil back in. Oil flush generally uses a chemical added to oil to clean sludge and other deposits from the parts of the engine where the oil comes in contact with. Most you add to oil, run the engine for 10 or 15 min and then drain the oil and add new oil, some you run it for a few weeks to a few months. Flushes are something you do once in a while or with a higher mileage car that may be running a little rough. There are many different oil flushes you can buy at stores or online.

 

running 10k miles on synthetic for the family fleet. Backed up by blackstone oil analysis

 

I do mine between 6k-7500 miles, the oil life monitor doesn't go off but the way I look at it....it is cheap peace of mind for me.

 

None of them are a good idea. Breaking loose bits of carbon in your lubrication system is about as smart as breaking loose a cholesterol clot in an artery.

 

You probably already know this, but that's what used to burn up some of the older turbos when you shut a hot engine off without an idle cool down.....non-synthetic or non-turbo-approved oil got so hot that it literally cooked and formed carbon-particles that plugged up the oil passages and burned up the turbo bearings. Sometimes those particles also got out into the engine itself and damaged it. Today, of course, better oils, better metal-alloys, oil-coolers, and cooling-jackets around the turbo with anti-freeze at 200-degree engine temperature have gone a long way towards addressing those problems.

 

If your draining the old/bad oil and changing the oil filter right after doing the flush it should be safe(if they were really harmful the companies that sold them would have been sued) If your engine is just coked full of deposits and sludge then that may be a different story but if your engine is that bad you have other much more serious issues then what a flush may do. If you don't drain the oil right after using a flush then yes it could be harmful and would certainly degrade the oil but doing a oil change right afterward is what most flushes require, I would not use or recommend a flush that works over a longer period. I have heard about and witnessed some significant improvements from doing a correct flush/oil change, I have heard trusted mechanics recommend them in some scenarios and have never heard of them causing harm though I am sure in some scenarios they could.

 

I don't have a 2014+ F30. I have a 2011 E90.

After the change and reset of the service indicator, it looks like my interval is actually 13k. Was definitely between 17-18k on the old E46.

 

Exactly how I feel, that's my general oil change interval with synthetic and a Toyota filter on my 2JZ powered Lexus.


This is the exact reason why I say BMW engineers are a bunch of idiots going with a 15k mile oil change interval on a turbocharged V8 engine. Especially with one that runs extremely hot, with the turbos and all the exhaust piping in the middle "V" of the engine. I mean do they simply not give a damn how long their cars stay on the road???? Is 100k miles considered "expected useful lifetime" to them ???

 

BMW quietly changed the oil intervals and increasing oil capacity after developing some nasty problems. Oh BTW you might have to change your battery every 10k miles too

http://www.roadandtrack.com/car-cult...ns-bmw-n63-v8/

 

isn't the exact same motor in the 14 535d?

 

Nope, not even close. I have an M57TU2, twin turbo with a cast iron block, 7.5L sump, and the timing chain on the front. The 535d has an N57, single variable turbo with an aluminum alloy block, 6.5L sump, and the timing chain on the rear. Totally different designs. They're both 3L straight-sixes with glow plugs and direct injection--that's about where the similarities end.

 

I usually do a 5,000 mile oil changes on my 2011 rx350, on my 2002 bmw 330ci I do 7500 mile oil changes since i daily this car, and on my 1995 miata I stick with 5,000 mile oil changes since i do drive this car very hard when i do drive it.