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So i did a little research and i can sum it up :
The serpentine belt is not related to timing. It is driven by the crank pulley to drive the peripheral components.
Once the belt breaks it can be sucked into the internals of the engine (crank shaft) how?
There is an oil seal between the crank shaft and the front pulley, since the pulley is very close to the block, once the belt breaks it can shred this seal and it would be sucked into the oil pan and creates an oil leak.
So you have to remove the oil pan to check this seal if the car leaking oil. Also radiator fan should be checked and all the pulleys.
The cause of the belt to break can be either the belt is old/worn or a pulley or the belt tensioner is bad (its spring may come loose with time or the bolt holding it to the block breaks) or an oil leak from the oil filter gasket (it leaks hot oil on the belt and worn it)
Good luck
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E90 328i n52 auto, 3 stage IM, k&n drop in, charcoal delete, silicone boot, ebay headers, secondary cats delete, bpc tune. MILVs (soon), MT swap (planning)
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