Quote:
Originally Posted by HeelToe
Mileage on the car? I replaced plugs on my 330i (same engine but different intake) and got almost 2 mpg. I had 70k miles and replacement was not recommended until 100k. That wouldn't explain all of your problem but you may have more than one item causing the issue.
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Currently it has 39k on it. Was it quite a task changing out the plugs? If the previous owner used 87, and now using 93 would that have something to do with the bad mileage?