It is my best assessment that in typical American person, male or female, you surrender your judgement and ability to find information from accredited and reliable sources preferring to write invisible strangers with no way to verify information provided. There are problems of technical nature and of emotional nature in your posting. In yet another typical American person, male or female, you make a simple issue way more complex that it is and then could it up more with the emotions expressed. IF BMW recommends and oil change of the synthetic oil every 15,000 miles, then that is EXACTLY what you do. Following the manufacturers recommendations does not hurt anything. Synthetic oil is basically a super lubricant with a molecular composition totally different than organic oil. The chain of molecules is flat like a sheet. Organic oil is clumpy and does no have the super lubricant capabilities. This means the following: synthetic oil does not gather moisture, it does not deteriorate, it clings to metal parts about 50 times better than organic oil, it cleans better and has a higher suspension capacity, and a few more I have forgotten. Synthetic oil is exclusively used in jet engines and while the oil in jet engines is not exposed to the products of combustion, for a new car with no mechanical issues, this is the same. Therefore, the is no reason to doubt the word BMW. Now, here is a common error in new drivers and uneducated drivers and or just not intelligent drivers. When an oil change is recommended it is NOT mandatory in a less number of miles. If you wish to have the car serviced more often, then YOU pay for that service, while BMW's interval is covered in the warranty. Call the dealership and schedule the oil change at 14,000 miles I do not think anyone is going to hold to the exact number of miles. For example, if you wish to have the oil changed at 8,000 miles or so, then do so. The 15,000 mile is by BMW. See? I told this was easy. However, it takes interest and knowledge and using the Internet and asking questions AT THE BMW dealership. We have people here that change synthetic oil at 6,000 miles. A waste of money. They just do not know the chemistry, the technology, the data points. And all you had to do was ask, not here, at the correct place. Information about synthetic oil is all over the Internet. But it is not going to be delivered at your door like home delivery pizza. YOU have to make an effort. I bet you also have not spent much time reading the car manual, and you need to. There is excellent information that you either need to know or need to know it exists so you can find it in the manual when needed. How do I know this? Because you ask about the oil filter. It is always part of the oil service and you have to do nothing. That is how I detect how uninformed you are and that you have not asked simple questions at the dealership. Go in peace. Schedule the oil service and read the manual while you wait. Stop using the smartphone for everything and engage that brain of yours. NO other way.

You do what you want but there is no way in hell that I would run any car 15,000 miles on the same oil. A lot of this is just used for a selling trick. Lets face it those engines aren't made out of some miracle material. They run under the same dirty, stressful conditions that all engines run under. Compared to the cost of rebuilding an engine, oil changes are pretty cheap so why take a chance..

Change your freaking oil!!!! The reason BMW recommends 15,000 mile oil changes is that it is on their dime. You should be changing that oil between 6,000-10,000 miles. Because the business model is to pay for service when these cars are new, BMW tries to limit the cost output with that outrageously long service intervals. Once the cars are 3 or 4 years old and out of warranty, they are no longer concerned with engine longevity as it's now someone elses financial problem. Have you checked oil levels at regular intervals or do you just assume it has the right amount?

To really find out how your oil is faring sitting in the engine that long get it analyzed at http://www.blackstone-labs.com/

Lastly, you ALWAYS change oil and filter together. ALWAYS.

I would recommend that you change your oil ASAP. For your 2013 BMW 335i 3.0L 6-cyl Engine Code N55 B30A Turbo You would need:

7 Quarts of Synthetic 5W-40 European Oil (EFMQT)

1 MANN Oil Filter (HU816x)

When you have a car with a warranty, it is very important to do whatever they tell you to do, when they tell you to do it. It's like a game of "Simon Says". The second you deviate from their instructions, if things go bad, all they have to tell you is, "Hey, you did/didn't do X, and thereby violated your warranty. It's not our fault, so we don't have to pay for it. Ha ha ha". I'm not saying they WOULD do that, but it's a risk you run.

As far as the oil, I wouldn't worry about it. Modern technology means cars, especially high-tech luxury cars like yours, can go longer between oil changes. If it's keeping you up at night, by all means, take it in for them to look at it. But whatever you do, ALWAYS FOLLOW THEIR RECOMMENDATIONS!!!!! And don't lose the paperwork either!

Engineers go to school for a long time to do what they do and egineers at BMW are some of the best in the world and they designed and made your BMW so why would you not do what the recomend?

BMW recommends an oil change roughly every 15,000 miles with synthetic oil. My 2013 BMW 335i currently has around 14,000 miles on it and I haven't changed the oil ever since I got it brand new. I know that it's a risky thing to do, but I didn't want to risk losing the warranty.

I'm especially worried because the past winter was very harsh and temps dropped as low as -7 degrees Fahrenheit. Also, while driving, the engine oil temperature does not reach the middle operating temp of 250F. It's usually at 175 during highway driving and a little under 250 at city driving. I've never seen it sit in the middle at 250F. On hotter days, I noticed that the oil temp is actually lower than it is on colder days.

On the plus side, I make sure my car is warmed up before I rev it up real high, which is a really rare occasion. I usually shift at 2,000 rpm regardless of oil temp.

Is my engine damaged from not changing the oil? Should I ask the dealer to change out the oil filter along with the oil? Can BMWs really go 15,000 miles without an oil change?