I have a new to me 528e 1987 and a 1994 530i. I am new to the forum. I have already chipped the 530i and may chip the 528e. It helped the 530i but the I wonder what gains vs the using premium I would get on the 528e? I like the milage on the 528e so it is my around town car. Would a chip help or woould the milage change? I have alerady changed the 530i microfilter and it was completly filled up. Yuck.
May join the Portland BMW group as I am already addict....
Thanks for any help