I am unaware of your vehicle, but mine was subpar; there is a substantial nut.The BMW F82 M4 differential employs a substantial, single-use M39 nut with a 1.5mm thread pitch for the input flange (pinion shaft), necessitating specialised equipment and considerable power for removal and accurate torque application. Nuts are also related with the axle shaft seals (output seals). I indicated that the Loctite used was not factory-sourced; however, it must have been, as the vehicle had only 20,000 miles at the time of purchase. Regardless, they successfully removed it, but my differential emitted a whine upon reassembly. Consequently, they procured a new differential and installed it, resolving the issue. Naturally, I incurred no costs for the new differential or associated labour. Nevertheless, I remain uncertain about the differences between the M4 and standard vehicles, as the differential fins and similar components are larger and more robust. The initial leak was addressed, and servicing is required following the leak repair.I required a pinion seal from a BMW shop. The service cost was £88, while the repair for the leak was approximately £400. My vehicle exhibited discolouration followed by a weep, prompting me to cease driving until I could schedule an appointment.