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Whilst it's not impossible for a 2002 M13a to have enough clearance in the mains for them to rattle, I think it's more likely for it to be the timing chain - if you're curious about it, hook an oil pressure gauge to the port and see what the pressure looks like at 4000 rpm with the engine warm, it should be between 39.8 & 61.1 psi, the lower it is, the more clearance in the mains.
