BMW 550i Spark Plug Replacement

Gap 0.044in; Plug Type RC9MC4

Gap 0.044"

Gap 0.044 Resistor Plug

Gap 0.044in; Plug Type RC12PMC4

Gap 0.044"

Gap 0.040 Platinum TT - Twin-Tip Technology Design with Platinum Center Electrode and Titanium Enhanced Ground Strap

Gap 0.044in; Plug Type RC10PLPB4

Gap 0.032in; Plug Type RERX6PMCB4

Original Center Electrode Material is Iridium Do Not Gap, Gap is Preset

Gap 0.044in OE Type ; Plug Type RC10WMPB4

Gap 0.044"

Gap 0.044 Iridium Power - Performance Upgrade with World's Smallest Center Electrode (0.4 mm Dia.) & Tapered Tip Patented U-Groove Design & Patented Ir Alloy (90% Ir)

Gap 0.032in OE Type ; Plug Type RERX5ZPYPB

Gap 0.040 Iridium TT - Ultimate Endurance and Power, 0.4mm Iridium and 0.7mm Platinum Twin-Tip Technology

Gap 0.044 Double Platinum Plug - Extra Long Life Double Platinum Plug with Platinum Ground Strap

Gap 0.044"

Gap 0.044" Actual OE Manufacturer

Gap 0.044"

Gap 0.032 O.E. Recommended Iridium Long Life - Patented Iridium Alloy Plug (90% Ir) with Platinum Ground Strap

NGK SILZBR8D8S

Gap 0.032" OE Equivalent Design 60,000 mi OE Mfr Recommended Service Interval

Gap 0.032"

NGK SILZBR8D8S

NGK SILZBR8D8S