|Oil Level Low (3 bars is low)|
|BMW 330i 2006|
This is the first time I've had to add oil to my engine this year and in this particular case I ended up adding 1 quart of oil to top it off. I can definitely tell the difference. I've always added 5W-30 Mobil 1 brand, and I've never had any problems.
|Oil cap, top right. (cover removed)|
Side note: On the intro picture above there are 3 bars (green bars), this is LOW oil level in my opinion, if you add a bit more oil to the engine the 3 bars turn to 4, which is better. I've found that 4 bars is better for optimum power output for the engine, 3 bars is okay, but low. Note that on the picture it states that the Oil Level is O.K. it's definitely okay, but not for optimum power. Also note that adding more oil at this point is actually bad, to be sure add a bit more oil and check level, keep doing this until you reach the 4 bars.
The last thing I wanted to say is that if you own a 2006 BMW 330i, you know about oil leaks, around the oil filter case, and around the valve cover manifold, if you have oil leaks there, oil will be low after a few months because oil is always coming out of these areas, although you should fix these problems because they can lead to more serious problems, if you keep driving the car to and from work for example, the oil level will drop little by little, so definitely keep an eye the oil level once every couple of months, and if you are low, top it off.