Grade 93+, your manual should have this info.
An e46(2001-2006) 325i/xi has a 16 gallon gas tank
The easiest way to replace the gas tank vent valve on 1994 BMW 325i is to replace the gas cap. The vent valve is attached to the gas cap and is easy to find through the dealerships or online.
The gas mileage of a BMW 325i will vary based on driving conditions. The estimated highway gas mileage is 29 miles per gallon. The estimated city gas mileage is 20 miles per gallon.
Unlocking the car doors normally unlocks the cover for the gas cap.
93
open your trunk-to the right side of your trunk you will see a green pull release lever that opens your gas flap-pull and you are good to go
no, only high grade. that is what the engine is made for but u can every 4 fill up put mid grade in
Premium 91+
Most BMW Cars Take Unleaded Or For Some Special Ones Diesel.
BMW only takes gas rated at octane 91 or higher, and that is Premium at the gas station.
Some models of the 2004 325i do not have an external fuel filter. They only have a filter inside the gas tank which is never replaced. These models I am told can be identified by having a steel gas tank. Have your dealer run the VIN to see if yours is one of these. I am not exactaly sure where the filter is for that specific car but should be as easy as find the gas line from the tank and follow it till you hit the enlargment in the tube where u can un cap it and take out the filter to replace it
get a crack in the muffler, my friend has a BMW 325i 94 and it backfires, when we checked whats the cause of it, it was because the muffler has a crack on it :p hope this helps :p, but it wont backfire unless the engine gets to a certain heat like the engine's normal heat. Ps. the car is gonna be noisy a bit btw :p