H&R 60mm ID Single Race Spring Length 160mm Spring Rate 260 N/mm or 1484 lbs/inch - RF160260 fits_2008-2015`Mercedes-Benz`C63 The viscosity of oil changes

The viscosity of oil changes as it's temperature varies which can lead to changes in the damping characteristics of the unit

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and most other brands

AutoTecknic G30 5-Series Dry Carbon Front Grille Surround Set

H&R 60mm ID Single Race Spring Length 160mm Spring Rate 260 N/mm or 1484 lbs/inch - RF160260 fits_2008-2015`Mercedes-Benz`C63 The viscosity of oil changesH&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and