Front Left Coil Spring (Separate) - 2011 528i

When sourcing a front left coil spring for your 2011 BMW 528i (F10 chassis), target OEM numbers 31-33-6-773-789 or its supersession 31-33-6-786-335. These springs are specific to the 2010-2011 N52B30 RWD models and interchange only within this narrow production window—avoid 2012+ N20 turbo-four or xDrive donor cars as their spring rates differ significantly. In the junkyard, inspect for collapsed coils, corrosion at the lower perch contact point, and verify the color code bands (typically blue/green for standard suspension) remain visible. Always replace upper and lower spring pads (part 31-33-1-094-463) to prevent noise. Installation requires a proper spring compressor due to the F10's strut design; note that BMW specifies replacing springs in pairs to maintain chassis balance. Common failures include sagging after 80k miles and bottoming-out symptoms from broken end coils.