Yes, it prevents knock and detonation. The knock sensor is just a sensor it only pulls timing after knock aka damage occurs. One tank will be fine but don't make it a habit.
Absolutely...it will run much worse using non-premium gas.
The BMW 323 i takes Premium gas,but can use mid grade as well. premium is preferred.
BMW only takes gas rated at octane 91 or higher, and that is Premium at the gas station.
BMW always recommends using 98 RON petrol (gas). Which is premium unleaded.
Premium 91+
BMW recommends using Premium Unleaded Gasoline with a minimum octane rating of RON 95 (equivalent to AKI 91 in the US)
Premium Unleaded according to the owner's manuals.
NO.. it does not need premium gas.. You only have to put premium gas in a car which recommends premium gas. I would recommend a fill up with some mid grade gas atleast once a month...
yes premium gas is required
not unless you have diesel.
yes
The good thing about the x3 is that it's a more reliable BMW than other BMWs. You can have the option of using regular or premium without damaging it. But even tho regular is cheaper, you get less miles to the gallon than premium. So it pretty much balances out. It's a better idea to use premium.