Hello! After reading thr thread about the Denso 0-2's I got one. I run pretty much a 50/50 mix of 110 leaded and 93 unleaded.So far after 300 miles this 0-2 has not been effected by the leaded fuel. I to had some difficulty in geting one locally. I finally found 1 after calling 20 or better auto parts stores. Everyone seems to carry Bosch- I guess because they are cheaper. If this one holds up the additional 5 or 10 dollars would not matter.So far so good!