Serpentine belt. If its cracked, frayed, or worn replace it before it breaks or you're in for a hefty repair bill.
Sounds like a slipping alternator drive belt. Adjust in accordance with manufacturers instructions.
iwhat does the noise sound like. most likely a worn belt or belt tensioner if its a high pitched squealing noise.
When refilling the oil some may have dripped onto the belt which would cause it to start slipping badly and squealing loudly.
my BMW does not start it just makes a click noise
You did not define "squeaky" but if there is a shrill noise when you startup or accelerate under engine load then it could be your serpentine belts slipping. Take a look at the 3 belts and see if they are glazed (shiny). If so then it is best to replace them.
i would take a good guess that when the starter is engaged through the sylenoid that it is sticking and when you go to shut it off it stays engaged
check your belts they can be worn and need to be replaced or they just might be cold unless its everytime you start the car if that's the case the might need to be tightened your ac belt or fan belt could be bad.
Sounds like a belt or belt tensioner needs to be replaced
Start with the most likely andeasiest to fix. Check your brake pads... There is a wear indicator on the inside pads (closest to engine) that will rub on the rotor and make a squealing noise to warn you that the pads are getting thin. When you apply the brakes the noise will go away a lot of the time. If the pads are new or not making the noise then I do not know what the problem may be.
You may need to adjust your belts, check the ac belt first.
cars tend too
If it's rear brakes there drums. Mine have made noise since it was new. Only when you first start up. I have a 96