5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
if you have a M20 then you will need to start using premium gas, but it should not hurt the reliability of your car. installing it should be easy, but it will take the engine a day or two to get used to it
i really dont think it would be bad to run 89 octane in a M20 no matter what kind of chip is in the ecu because it doesnt affect compression, but i would probably use premium just in case. if you have a M50 (which i think started in the 1991 525's) then you have to use premium no matter what. its not likely that a chip will do any harm to your ecu if you buy a conforti or a another big brand, and its not like it can crash like Windows can
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