Patent ID: 8852298

Claim:
A method of forming reduced conductivity deposits on spark plugs, said method comprising: combusting a fuel comprising ferrocene and a manganese-containing compound in an apparatus comprising the spark plugs, the treat rate of the manganese-containing compound ranging from about 1 to about 20 mg of manganese per liter of fuel, the weight ratio of iron metal to manganese metal in the fuel ranging from about 2:36 to 35:36, wherein the apparatus is chosen from spray guided-, wall guided-, and combined wall/spray guided-direct injection gasoline (DIG) engines; turbocharged DIG engines; supercharged DIG engines; homogeneous combustion DIG engines; homogeneous/stratified DIG engines; DIG engines outfitted with piezo injectors capable of multiple fuel pulses per injection; DIG engines with EGR; DIG engines with a lean NOx trap; DIG engines with a lean-NOx catalyst; DIG engines with SN-CR NOx control; DIG engines with exhaust diesel fuel after-injection for NOx control; DIG engines outfitted for flex fuel operation; advanced port-fueled gasoline engines; gasoline-fueled homogeneous charge compression ignition (HCCI) engines; gasoline HCCI-electric hybrid engines; and gasoline-electric hybrid vehicles, wherein the manganese-containing compound is methylcyclopentadienyl manganese tricarbonyl.