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How often should I change the oil in my 2004 BMW 330i? I've heard 7,500 miles and 15,000 miles. Does it make a difference?

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Yes it makes a difference. You can never go wrong following the manufactures recommendations in your owner's manual. Saying that, I recommend every 5,000 miles if you use conventional oil and every 7,000 miles if you use synthetic and drive normally. If you drive mainly highway driving you can extend these 1,000 miles. Just as important is to change the filter at every oil change and to use a quality filter such as Purolator, Wix, AC/Delco, Motorcraft, or Bosch. Avoid cheap filters. Also important to a clean engine is to change the air filter every 30,000 miles.

Posted on May 25, 2010

  • Rob
    Rob Dec 16, 2010

    Let me start off by saying that I am a BMW Level 1 (master tech). As long as you are using a FULL synthetic (BMW recommends Castrol 5W30) you will be fine doing your oil services every 15K miles. And like Clay said, a quailty oil filter is also key to the life of the oil as well, but from past cars I have seen, only original BMW oil filters seem to fit well. But if you dont put that many miles on your car, the do an oil change once a year. I have worked on many high mileage cars that maintained there BMW regularly, and had no signs of sludge in the engine.

    And here is something to think about. Up until recent years, most manufactures were saying that 3k miles for every oil change (for non-synthetic motor oil). At that rate thats 5 oil changes for every one in a BMW. Now yes going to the BMW dealership can get expensive ( a oil change will run you about $100 bucks) but think about the 5 oil changes in a regular car at $20 a pop? Didnt seem like that much at the time but it adds up. So really you oil service is costing you the same as a regular car.



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How do i change the oil on a bmw 330i


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Changing oil every 3000 miles?

i have heard a lot of chatter about changing your oil every 3000 miles now to clarify if your vehicle was made before 2000 or you drive on dusty roads or up hills all the time most manufacturers don't recommend you change your out till 7,500 miles buy doing this it will save you a lot of time an $$$$ in the long run

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How often should I change the oil in my 2004 BMW 330i? It says to get an inspection every 15,000 miles but that seems like a long time.

While 15,000 miles between oil changes seems excessive, modern vehicle components and advances in lubrication products makes frequent oil changes unnecessary. Even thougth its' not required, I have my oil changed every 3,000 to 5,000 miles. I have the work done by a reliable repair shop for half what the dealer would charge. My attitude is why not spend a few extra $$ for the oil change to help ensure the longevity of the engine.

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How often should oil be changed ?

That depends on the brand and type of synthetic you use, as well as the type of oil filter. Mobil 1 makes an extended service full synthetic, which they claim is good for 15,000 miles between changes. Amsoil full synthetic advertises 25,000 miles between changes; but only if you also install and use one of their super fine bypass oil filters, in addition to your car's regular oil filter.

Since the actual mileage you can go between oil changes is very dependent of the type of driving you do, the brand of oil you use, and the condition of your engine; there really is no hard and fast rule. That's why commercial vehicle fleets regularly take samples of their oil, and send it to laboratories for analysis to determine whether it needs changing. Sometimes it is necessary to change oil more often than expected; other times you can go longer between changes. My experience has been that, when oil is nearing the mileage where it needs changing; the rate of consumption will significantly increase. So when my car needs a quart added, it usually means it ought to be changed.

Regardless of the oil you use; if the change intervals are longer than the car manufacturers recommendations, it will void your factory engine warranty. That said; I have typically felt comfortable with 7,500 mile change intervals when using full synthetic oil of an appropriate viscosity.

I would also add that it is much safer to stay with only one brand and type of oil for the life of your vehicle; this is true for both conventional and synthetic oils. I have seen too many engines ruined by switching to a different brand or type of oil. Mobil 1 is chemically different from all the other synthetic oils, and is closer to petroleum oil in its characteristics. I prefer it for that reason. They also make a european formula 0W-40 full synthetic, which is available in the U.S, and is my preferred viscosity for all around use. It is not one of their extended service oils; but the protection is far superior to other oil grades. Not all stores carry it; but it can often be ordered from stores which carry other Mobil 1 products; and can always be bought from the local Mobil oil distributor.

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