What should my pressure be? Make Model Spec CLK. 18 AMG OPTCLK. 200, 240, 280, 350, 320CDI. AVANTGARDECLK. 200CGI. ELEGANCECLK. 200K, 240, 280, 220CDI. ELEGANCECLK. 270CDI. ELEGANCECLK. 320. ELEGANCECLK. 350, 320CDI. ELEGANCECLK. 500. ELEGANCECLK. 500. ELEGANCE, AVANTGARDE, SPORTCLK. AMG 18 OPTCLK. ELEGANCE 17 OPTCLK. SPORT EDITION