Best Turbo Oil & Coolant Lines for BMW 3 F31

When it comes to turbo upgrades on the BMW F31, most builds centre around the N20 or N47 engines depending on whether you're working with a petrol or diesel variant. For the N20-equipped models, the MHD or Burger Motorsports JB4 tune paired with a Vargas Turbo upgraded CHRA is a well-proven combination that delivers noticeably sharper mid-range torque without sacrificing daily drivability. The Pure Turbos Stage 1 upgrade is another popular choice, offering improved compressor wheel specs that support power figures pushing comfortably past 300bhp on a supporting bolt-on build. On the diesel side, the N47 responds well to a hybrid turbo conversion using a Mitsubishi or BorgWarner cartridge swap, which works particularly well alongside an EGR delete and remap from a specialist like Diesel Tuning UK or Celtic Tuning. Before committing to any turbo upgrade on the F31, always address supporting modifications first - upgraded intercooler piping, an uprated BOV or DV, and a reinforced charge pipe are essential since the factory plastic charge pipe is a known weak point that will split under increased boost pressure and ruin an otherwise solid setup.