Unveiled in 1996, the BMW 5 Series Touring E39 translated all the dynamic brilliance and build quality of the acclaimed E39 saloon into a handsome, exceptionally practical executive estate. Featuring an independently opening rear window, a flat load bay and optional self-levelling rear pneumatic suspension, it remains a benchmark modern classic. Sustaining its composure calls for methodical BMW 5 Series maintenance, particularly around aging cooling and estate-specific running gear.
Under the bonnet, early petrol models feature the silky M52 and twin-VANOS M52TU straight-six engines (520i, 523i, 528i). The entire cooling system - plastic radiator neck, expansion tank, thermostat housing and water pump - is fragile and must be overhauled preventatively to safeguard the engine block. Furthermore, the self-levelling rear air suspension rubber bellows perish with age, causing the car to squat when parked.