rattling noise cold start ?

[M6ORL]

so i bought this car a couple of weeks ago after send it to bmw for pre purchased inspection everything came out good but when i got delivery of the car i noticed a rattling noise in the engine on cold start  called the dealer who check the car and they said some noise are expected since is a high performance car, now after doing my research I'm wondering this may be something else what do you guys think??

here's some youtube videos...

[Dwaynos]

The top video sounds normal ish to me. The ticking you hear is due to the high pressure of the fuel injectors. The bottom video (cold start (1)) sounds odd though as mine goes quiet after the engine goes back to idle speed. It could be the microphone exaggerating the sound on our side. Does it sound exactly the same in person?

[M6ORL]

Originally Posted by Dwaynos

The top video sounds normal ish to me. The ticking you hear is due to the high pressure of the fuel injectors. The bottom video (cold start (1)) sounds odd though as mine goes quiet after the engine goes back to idle speed. It could be the microphone exaggerating the sound on our side. Does it sound exactly the same in person?

after the idle go regular the sound keep until the car reach some temp , after the car warms up i can turn the car off and wait a hour or two and doesn't sound at all when i start the csr again , researching on internet i came out with differents opinion (vanos) ( belt tensioner ) but if was it belt tensioner the sound have to be there every time i start the car no? the car sit at 60k miles right now.. vanos can be a common ossue at this mileage ?

[Dwaynos]

It's very difficult to diagnose a noise from a video unfortunately. I'm not sure about vanos issues on the f10. I know the e39 and the e60 both had vanos issues. The only thing I can tell you is that mine has a similar noise on cold start and it's a ticking of the injectors.

[Craze]

Sounde noisy to me

Best to get opinion of someone independent

[M5Rick]

Seems a bit hissy and clattery,when was the last oil service and what was the make/grade of oil used.

[M6ORL]

Originally Posted by M5theonlyone

Seems a bit hissy and clattery,when was the last oil service and what was the make/grade of oil used.

not sure when was the previous oil change but im gyessing a couple of thousand i had to top it off like 3 days ago * yesterday did a oil chsnge LM 5w-40

[M5Rick]

Originally Posted by M6ORL

not sure when was the previous oil change but im gyessing a couple of thousand i had to top it off like 3 days ago * yesterday did a oil chsnge LM 5w-40

..and it's the similar noise with the oil change.

[M6ORL]

Originally Posted by M5theonlyone

..and it's the similar noise with the oil change.

i just turn the car on now and the noise its wayy less than before now sounds like a normal car , who knows how many mile had that engine oil on the car :/ *

[M5Rick]

Originally Posted by M6ORL

i just turn the car on now and the noise its wayy less than before now sounds like a normal car , who knows how many mile had that engine oil on the car :/ *

If it's better now then you may have had a poor quality oil in it before or it was just worn, the LM is a good lubricant in the right grade and quite a few US forum members say they use it.

[boots]

I've never heard that b4. and I've got almost 130k on my car. it's not waste gate sounds either.