When running extra boost, making sure you have enough octane is vital. Without it you run real risks of catastrophic engine failure. Boostane Octane booster answers those questions and removes those risks. Simply add the right amount to meet your octane needs.
The BMW B58 found in the M140 is no exception to this. The M140i JB4 can increase power levels to approx 430bhp, up from approx 340bhp stock, so running more octane is highly recommended.
Half a can of Boostane octane booster to a full tank of 99ron SUL such as Tesco 99 or Shell V-power will give you enough octane for your M140i running JB4.