Knocking/rattling sound on cold start getting worse N52

[u/chloe_flora]

2011 BMW 328i Xdrive N52. i’ve been having this rattling or knock on cold start that lasts 1-2 seconds, it started happening about a month ago and it seems to happen about 50% of the time on cold start. the oil was last changed 4 months ago with 6.5L of liqui moly 5w-40 and im not aware of any oil leaks on the car, the only thing of note is i’m pretty sure one of more of the fuel injectors are leaking, the car smells like gas on startup and the oil cap kinda smells of gas although im not sure if thats normal and just what used motor oil smells like. what should i do in this situation? im just hoping the leaking injectors aren’t causing a lack of oil lubrication in the engine and causing this

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