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Old 04-01-2011, 06:45 PM   #3
Mango
e46mango.com
 
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Join Date: Mar 2006
Location: Southern California
Posts: 25,720
My Ride: 2016 Lexus
Cooling (Radiators especially prone to cracking more so than the expansion tank--replace both to be safe) actually, replace ALL cooling components.
Suspension (usual FCABs, shocks will be dead if they are original)
RTAB pockets (Check these for cracks)
Rear shock towers/Front shock towers (Check for cracks or mushrooming--S52 cars less prone but still check)
Oil pump nut (Like the M54, susceptible to undoing itself usually under track conditions)

Other than that, rock solid reliable car.
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