Bimmerfest - BMW Forums - View Single Post - What is the average MPG of you 87 535 is
View Single Post
Old 06-22-2008, 07:35 AM
323ivabeach 323ivabeach is offline
Officially Welcomed to the 'Fest
Location: Virginia beach VA
Join Date: Oct 2006
Posts: 271
Mein Auto: 2000 323i
Originally Posted by jimoreno View Post
I hope that you are not putting any premium gas. These engines are designed to run on regular 87 octane fuel. The only time that you might need higher octane fuel is if you have replaced the computer chip that advances the timing in order to get more power out of it; if you don't you are just wasting money. Just make sure that you use good brand gasoline (Top Tier) and not ethanol blends. Keep in mind that these are 20 plus year old engines with really old engine control computers without knock sensors and the like.

This is true, as I noticed I was getting worse mpg from premium the one time I filled up with it. My 1986 528e with 342k miles on it still gets about 24 mpg on regular.
Reply With Quote