BMW X3 M40i Engine B58B30B for Sale

Product Overview

For sale is a brand-new BMW X3 M40i engine, code B58B30B, manufactured in 2020and at new mileage — zero operational use. This is the turbocharged inline-six engine fitted to the BMW X3 xDrive M40i (G01), producing 265 kW (360 horsepower) and 500 Nm of torque, and is supplied complete as shown in the listing photographs with all components in factory condition.

The B58B30B is the M Performance-specification variant of BMW’s acclaimed B58 3.0-litre inline-six — one of the most highly regarded six-cylinder petrol engines in the current market — calibrated to the higher output of the M40i application. At new mileage, every internal and external component is in factory condition, providing the highest possible quality of replacement engine for any X3 M40i owner or specialist workshop.

Engine Specification

B58B30B Cross-Model Compatibility

The B58B30B engine code is used across a range of BMW M Performance models sharing the same higher-output B58 specification. While this engine is listed specifically as an X3 M40i unit, buyers from the following compatible applications may also find this engine suitable — subject to confirming the exact engine code against their own vehicle prior to purchase:

Buyers from any application other than the X3 M40i G01 should cross-reference their vehicle’s engine code stamp with the B58B30B designation and confirm compatibility through BMW dealer systems or an independent specialist before purchasing. Please contact us to assist with verification.

About the BMW B58B30B Engine

The BMW B58B30B is the M Performance variant of the B58 3.0-litre inline-six — distinguished from the standard B58B30A by its higher output calibration, uprated turbocharger specification, and reinforced components suited to the additional thermal and mechanical loads of M Performance application. In X3 M40i specification, the B58B30B produces 265 kW (360 hp) and 500 Nm — output figures that give the X3 M40i its characteristically brisk performance across the full rev range.

The B58 engine family as a whole is considered one of BMW’s finest modern engine architectures — a multiple International Engine of the Year award winner praised for its power density, refinement, and tuning potential. The B58B30B’s M Performance specification takes these qualities a step further, with calibration that prioritises throttle response and peak output over the fuel economy-focused mapping of standard B58 variants.

As a 2020 manufacture date engine, this unit reflects the most current B58B30B production specification — incorporating any running changes or engineering improvements made to the engine during its production life up to that point. For owners replacing an earlier X3 M40i engine, this unit may incorporate refinements not present in the original factory fitment.

Ideal For

• BMW X3 xDrive M40i (G01) ownersrequiring a direct engine replacement following failure, turbocharger damage, timing chain issues, or mechanical damage
• BMW and M Performance specialist workshops sourcing a new-mileage B58B30B for a customer replacement
• Buyers seeking new-BMW-dealer-equivalent engine condition at a saving to official BMW supply pricing
• X4 M40i, 540i, or 340i owners with confirmed B58B30B compatibility requiring a new engine
• Performance tuners working with the B58 M Performance platform who require a new core for a high-output build
• Insurance repair specialists requiring a correct-specification, new-condition engine for an X3 M40i repair

Purchasing & Enquiries

This BMW X3 M40i engine, code B58B30B, is available for immediate sale. It is brand new, manufactured in 2020, at new mileage, and supplied complete as shown in the listing photographs.