Buy 2010 Volvo S40 Coil Spring (Rear). REAR SPRING. S40. V50. Suspension Coil Spring Your coil Helical, NIVOMAT, Details - OEM Volvo Part # 30666218

MARKED 11. Spring, Helical Spring and Torsion Spring. Without NIVOMAT.
For Marking, see Vehicle Details.
A Coil Spring is a spiral or helix of metal wire that is commonly made up of steel and is used in many automotive suspension systems. Coil Springs are mechanical devices that accept a weight or force from one object to absorb the energy and to prevent the surface from being damaged.

Fits C30, C70, S40, V50

S40. V50.
Suspension Coil Spring
Your coil springs are not especially prone to failure, but if they have been cut, clamped, or heated to have the vehicle lowered, your 2010 Volvo S40 might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Volvo service department to have your suspension system evaluated.