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BMW 3-Series (E90 E92) Forum
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is oil change every 9000km too much...?
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07-19-2009, 01:44 PM | #1 |
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is oil change every 9000km too much...?
i DIY my oil change between the free dealer change. changed once already and i'm at 15,500 kms on the odometer. the first time i changed oil i cut open the oil filter and found tiny thin metal shavings but i guess that's normal from a new engine. i'm somewhat uncomfortable with changing oil once very 20,000+ kms. i used castrol syntec 5w30 and it costs me about $60 per change including a new filter from dealer i guess its fine. what are your views about this?
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07-19-2009, 03:56 PM | #2 |
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07-19-2009, 06:49 PM | #4 | |
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what amazes me most is that people out there *think* somehow their know how on the subject is better than that of the factory that built the car. Yeah the millions and millions that BMW spent on R&D on engines is simply not as good as the opinion of Joe the mechanic with a golden tooth, who I might add has lots of incentive to see you often at his garage.
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07-19-2009, 08:01 PM | #5 | |
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5-6k miles for oil change.
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Secondly, BMW has to pay out if its pocket for your scheduled maintenance. If the interval is every 5k, then they'll be losing a lot of money. Granted, a car can still run fine if it had intervals of 20k miles before an oil change. However, compare that same car to a car that had oil change every 5k miles, the difference in engine performance after a long time will be huge. And who would actually go to a mechanic for an oil change? Anyone who visits a car forum and doesn't know how to change their oil should be ashamed, very ashamed. Last edited by samchoi604; 07-19-2009 at 08:17 PM.. |
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07-19-2009, 10:52 PM | #6 | |
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And yes, some people do pay for oil changes because of many reasons. Some aren't mechanically inclined and some just don't like to get dirty and some simply don't have the place to do them. Nothing to be ashamed about.
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07-19-2009, 11:02 PM | #7 |
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07-19-2009, 11:02 PM | #8 | |
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It's cool, but do you have any source for your last statement? For my side of the argument, someone actually has done a study on the dirty oil for an N54 engine. The results are below: -High iron count which was 3 times the average of those who have changed at 5500 miles -High Nitration, which indicates the oil was used longer then it should have been. -Viscosity higher then average. Remember, viscosity testing is done at 210 degrees farenheit, which is 40-60 degrees lower then normal operation oil temps in the n54 engine. Viscosity is thought to have a direct relationship with oil temperatures. Higher the temperature, the more the oil loses its strength. Now imagine what the viscosity is at 250-270F. With those things being said and from speaking with several different fluid dynamic engineers, BMW is wrong for saying it's ok to change the oil for the n54 engine at 15,000 miles, especially with higher then average oil temperatures. http://www.e90post.com/forums/showthread.php?t=280168 |
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07-20-2009, 07:53 AM | #9 | |
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And as for folks changing their own I'd love to be able to...and always did until recently.But the surgeon who recently replaced my hip (yes,I'm an old fart!) has told me that my days of changing my own oil are over. |
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07-20-2009, 08:55 AM | #10 |
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I discovered that with synthetics sludge build up is virtually nonexistent. Recently I had the valve cover of my M3 out to do a valve adjustment and I was simply amazed by the cleanliness of that 20 year close to 6 digits mileage engine. It was squeaky clean.
Now don't get me wrong I am not saying that going from 15K intervals down to 5K makes no difference. Guess what, if you changed your oil every day vs 5K it would make a difference too. I am saying that the difference as it relates to the rest of your car is negligent. I come across this ALL the time, people proudly changing their oil every 5K and then when you asked them when was the last time they've done brake fluid flushes or coolant flushes they look at you with that "what is that?" face. The point I am getting at is that extra oil change you were planning on doing is better to be replaced by another maintenance task to the car or set that money aside for when you really need it. If 5K changes make you sleep better at night then do it, piece of mind for less than $100 is well worth it.
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07-20-2009, 10:57 AM | #11 |
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how often did you change your oil on your m3?
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07-20-2009, 10:58 AM | #12 | ||
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07-20-2009, 11:10 AM | #13 |
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i dont get dirty changing my oil. i actually consider it a fun time haha. usually it takes me 30 mins but i take 1 hr because i also clean the engine compartment and some quick detailing. with DIY my car's oil gets changed whenever i want. i don't need to drive anywhere or make any appointments.
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07-20-2009, 12:21 PM | #14 | |
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07-22-2009, 12:48 AM | #16 | |
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07-22-2009, 01:45 AM | #18 |
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While at the BMW Welt in Munich, I asked the technician who was setting up/assisting with the delivery of my car what his opinion was on this subject. Granted he is not an engineer nor a mechanic, but he has been working with BMW's for the better part of 15 years and owns one himself.
He said that he has heard many opinions on oil changes himself, both from customers and from co-workers. He said that he follows the recommendations made by BMW on his own car (a three-door 1-Series). He said that many people are adamant on the 7,500 km oil change, but he believes this is a hold-over from cars of the past. While his opinion is by no way a "standard," I put it out here just for one other idea on the subject. I myself am still undecided, but will probably do a break-in oil change around 7,500 km and then follow the recommended schedule from BMW. |
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