Own a few R53's last few years from modded to oem and a fun weekend go kart for backroads. I drive one as a daily the past year that replaced my daily E39 530d.

Most R53's are hitting 100k mile marker where the maintenance kicks in. Supercharger service is more labour intensive than anything (kit about €80) and stripping the front off to get at it. You may as well do all the coolant system and pretty much every oil seal. Oil filter housing seal and o rings usually weep at this stage along with the usual rocker cover and crankshaft seal. Alternator case usually cracks with age and power steering pumps too but most will have been replaced under warranty from new.

I have yet to buy R53 with no oil leak (like toilet training a puppy) and the biggest problem with ownership...is the addiction of modding them.

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