The Bmw B58 Engine as used in the BMW M140i,M240i,340i,440i,Z4 M40i amongst others and the Toyota A90 Supra has a few issues including worn piston bores.
This is affected from low to high mileage cars. Here we discuss further into what causes it…
TOYOTA SUPRA A90 B58 BMW Engine Piston Bore Failure – Youtube
