The E39 is the fourth-generation 5 Series and is still widely regarded as one of BMW's best-resolved executive saloons, with an aluminium front suspension, balanced weight distribution and a cabin that has aged unusually well. The 520i is the entry point to the six-cylinder range and the badge covered three different engines: the 150 hp 2.0-litre M52B20 from launch, the double-VANOS M52TUB20 from 1998, and from the September 2000 facelift a 170 hp 2.2-litre M54B22 that kept the 520i name. It was sold as a saloon, built from January 1996 to August 2003, and as a Touring, built from March 1997 to February 2004, with a five-speed manual or an optional five-speed automatic; drive is always to the rear wheels.· more· less
Smooth, chain-driven inline-sixHuge parts supply, strong specialists
Plastic cooling parts fail with ageSills and jacking points rust
Buy if: You want a well-preserved six-cylinder executive saloon, have checked the sills and jacking points properly, and can see recent cooling system and front suspension work in the paperwork.
Avoid if: You need low, predictable running costs from a car well over twenty years old, or the example in front of you has bubbling sills and no evidence of cooling system work.
Maintenance costs
€800 – €1,550/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€450 – €800 /yr
Risk bufferunplanned repairs€350 – €750 /yr
Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Maintenance costs
Maintenance assumes 15,000 km a year. Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Plastic radiator tanks, expansion tank, water pump impeller and thermostat all age out together · more· less
The E39 cooling system is built around plastic parts that go brittle with heat cycling: the radiator end tanks, the expansion tank, the water pump impeller and the electronically mapped thermostat. Failures tend to be sudden rather than gradual, and the expansion tank in particular is known to split at the seam or around the level sensor with no warning. German independent workshops and owner communities treat a complete preventive renewal (radiator, expansion tank, water pump, thermostat, hoses) as normal practice once a car passes roughly 150,000 km or ten years, and quote around €500-900 for the package. One German independent charged €590 for a radiator and expansion tank alone, including two hours labour and coolant. The reason to do it preventively is the consequence: the all-alloy M52 and M54 cylinder head does not tolerate overheating, and a warped head or a failed gasket turns a €700 job into €1,500-3,000. Assume this work is due unless invoices prove otherwise.
Corrosion at sills, jacking points and wheel arches
€300 - 2,5002 of 10
Sills rot from the inside out under the plastic covers and take the jacking points with them · more· less
The E39's sills carry sound-deadening material inside the box sections that soaks up water and holds it against the steel, so corrosion works outwards from the inside and stays hidden behind the plastic sill covers until it breaks through. The jacking points usually go first and are a straightforward roadworthiness failure once perforated. Other established hotspots are the rear wheel arches and the lower quarter panel where it meets the rear bumper, the boot lid around the lock and the number plate light housings, the fuel filler flap, the bonnet edge, the spare wheel well and, on Touring cars, the rear window frame. German body shops quote roughly €250-300 per side for a basic jacking point repair, €800-1,500 for a properly cut, welded and painted sill section, and owners report €2,500 and upwards once the inner sill is involved. Northern European cars that have seen winter salt are the worst affected.
Front thrust arm and control arm bushing wear
€250 - 8003 of 10
Hydraulic thrust arm bushings tear and leak, giving steering shimmy under braking · more· less
The E39 front suspension uses a fluid-filled hydraulic bushing in the thrust arm, the rearward of the two lower arms. The rubber tears, the fluid escapes and the arm is then free to move under braking load. The classic symptom is a side-to-side shimmy through the steering wheel at roughly 80-110 km/h, often only when braking, plus a clunk when moving off or stopping, and cupped or inner-edge wear on the front tyres. Owners typically see this at 100,000-130,000 km, so on a car of this age the bushings are usually on their second or third set. Because the ball joint is part of the arm, most workshops fit complete thrust arms and control arms rather than press bushings: budget roughly €250-400 for a Lemförder or Meyle HD set in parts and €400-800 fitted at an independent shop. Front strut top mounts, tie rods and anti-roll bar links normally need attention in the same visit.
Oil leaks from the valve cover and oil filter housing
€150 - 7004 of 10
Both gaskets harden with age, and the filter housing drips onto the belt and alternator · more· less
Almost every high-mileage M52 or M54 leaks from at least one of the valve cover gasket, the oil filter housing gasket or the sump gasket. A leaking valve cover gasket puts oil onto the exhaust manifold, which produces a burning smell and visible smoke from under the bonnet at a standstill. The oil filter housing gasket is the more serious of the two because the oil runs down onto the accessory belt and the alternator, and a soaked belt can shred and take pulleys with it. A valve cover gasket is roughly €150-300 fitted at an independent shop; the oil filter housing gasket typically runs €300-700 depending on how much has to come off. German owner reports put normal oil consumption on a healthy engine at around one litre per 3,000 km, so anything much higher points at leaks, the crankcase ventilation system or, on the earliest cars, bore wear.
VANOS wear and cold idle rattle
€150 - 9005 of 10
Piston seal rings harden and the unit rattles, costing low-end torque and idle quality · more· less
The 1996-1998 M52B20 uses single VANOS on the intake camshaft; the M52TUB20 from 1998 and the M54B22 from 2000 use double VANOS on both camshafts. In every version the sealing rings on the VANOS pistons harden and shrink with age, so the unit loses the oil pressure it needs to hold cam timing. Symptoms are a stumbling or lumpy cold idle, a flat spot below about 3,000 rpm, poorer fuel consumption and, once wear is advanced, an audible chattering rattle from the front of the engine at idle. Specialists report that the seals are typically past their best by around 50,000 km, so on a car of this age the question is whether they have been renewed, not whether they have worn. Seal and anti-rattle kits are cheap at €30-90, so the cost is almost entirely labour: expect €150-300 from an independent who charges a half day, and €500-900 for a workshop-fitted rebuilt unit. VANOS solenoids and the camshaft and crankshaft position sensors can produce similar symptoms and are worth ruling out first.
Instrument cluster pixels and ageing body electronics
€100 - 6006 of 10
Cluster and radio displays lose pixels, plus window regulators, blower resistor and light module · more· less
The ribbon cable behind the LCD in the instrument cluster and in the on-board computer or radio display loses contact with age, so blocks of the display go blank. Specialist repair firms treat this as a routine job at roughly €80-200 per unit; a replacement cluster from a dealer runs into several hundred euros, and a used unit carries its own stored mileage so it will flag a mileage discrepancy on the dashboard. Beyond the displays the usual age-related list applies: window regulator clips break, the heater blower final stage resistor fails so the fan runs only at full speed or not at all (part around €80-150), the light control module can leave a headlight on with the key removed or throw phantom bulb warnings, and door lock micro switches and the boot release stop working. Individually none of these is expensive, but on a neglected car they arrive together.
Crankcase ventilation system clogging or freezing
€200 - 6007 of 10
The pressure regulating valve sludges up or ices in winter, raising oil use and blowing seals · more· less
The M52 and M54 use a pressure-regulated crankcase ventilation valve with an oil separator, mounted where it is awkward to reach. Over years of short journeys the valve and its hoses fill with sludge and emulsified oil, and in cold climates the condensate inside can freeze. That builds crankcase pressure and pushes oil past the valve cover gasket and the rear main seal. Symptoms are a whistling or sucking noise from the engine bay, high oil consumption with no visible drip, a rough idle and oil in the intake tract. The parts are cheap at around €80-150 for a full kit, and BMW offered a cold-weather version of the valve and connecting line, but the intake manifold generally has to come off, so a workshop job lands at roughly €200-600. A car used mainly for short urban trips should be assumed to need this.
DISA intake flap wear on M52TU and M54 engines
€150 - 5008 of 10
The variable intake flap's pivot wears out and the flap can eventually break loose · more· less
The M52TUB20 from 1998 and the M54B22 from 2000 use a two-stage intake manifold with a DISA valve that swings a flap to change the effective runner length. Pressure pulses inside the plenum vibrate the flap against the bell crank lever, the glass fibres in the flap erode the softer lever, and the joint develops play. A worn valve gives a rattle on acceleration, a torque dip in the mid range and worse fuel consumption; in the worst case the flap detaches and can be drawn into a cylinder, which is expensive. Specialists put typical life at around 110,000-160,000 km. A replacement valve is roughly €80-180 and is held by two bolts, so this is cheap by BMW standards, and repair kits with a metal bushing are also sold. German used-car advisers list this as one of the defining faults of these two engines, so reach in and check the flap for play at viewing.
Automatic gearbox neglect on lifetime-fill cars
€300 - 2,5009 of 10
BMW declared the fluid a lifetime fill, so most surviving automatics have never had it changed · more· less
Automatic 520i models used a five-speed unit throughout the run, and BMW declared the fluid in it a lifetime fill. Independent BMW specialists and the owner community disagree and recommend a fluid and filter change roughly every 100,000 km or five years, because degraded fluid is what takes out the torque converter lock-up clutch and the clutch packs. On a car of this age most automatics have simply never been serviced. Symptoms are harsh or delayed shifts, a shudder at light throttle around 60-80 km/h, and eventually slipping under load. Fluid specification matters as much as the interval: these gearboxes need the correct ATF, Pentosin or an approved equivalent to ESSO LT 71141, and mixing types is a documented way to destroy one. A fluid and filter change is €250-400 at an independent shop and is the single most useful thing an owner can do for one; a rebuilt or good used unit is €1,500-2,500 fitted. Manual cars avoid this entirely and only need a clutch in due course.
Nikasil bore wear on early M52B20 engines
€1,500 - 4,00010 of 10
European blocks built to early 1998 used a bore coating that high-sulphur fuel attacked · more· less
European-market M52 engines built between 1995 and early 1998 used an aluminium block with a Nikasil bore coating. Sulphur in the fuel of that period reacted with the nickel in the coating and stripped it, producing bore wear, rising oil consumption, a rough or failed cold start and low compression, sometimes at surprisingly low mileage. BMW moved to an aluminium block with cast iron cylinder liners for the M52TU in 1998, which removed the problem, and replaced many affected engines under goodwill at the time. Two things make this a low rather than a high risk today: pump fuel has been low sulphur for decades so a coating that is still intact will not now degrade further, and almost every badly affected engine failed and was dealt with more than twenty years ago. It still matters on a pre-1998 car, because the remedy is an engine, so a compression or leak-down test and a careful look at oil consumption and cold-start behaviour are worth the money on a 1996-1997 example.
Sound engineering, but every perishable part is now at the end of its life
The M52 and M54 inline-sixes are chain-driven, lightly stressed and routinely reach 300,000 km, and the E39 chassis and structure are well engineered. What drives the cost of ownership is age: plastic cooling parts, rubber bushings, gaskets, display ribbons and sill cavities have all been in service for more than twenty years, and they wear out on a timescale rather than a mileage. A car with documented cooling system, VANOS and front suspension work and solid sills is a genuinely usable long-term proposition. One without that paperwork is a queue of jobs waiting to be paid for.
Service history
Continuous stamps or invoices matter more than whether they are from BMW. Look for oil changes at least once a year regardless of distance covered.
Tires
Check tread depth, date codes and wear pattern. Inner edge wear or cupping on the fronts points at worn suspension bushings, not just alignment.
Cold start
Insist on a genuinely cold engine. Listen for rattle in the first seconds, watch for blue smoke and check that the idle settles cleanly.
Test drive
At least 20 minutes including motorway speed, so the cooling system, gearbox and VANOS all reach full operating temperature.
Specific for this vehicle
Lift the plastic sill covers and inspect the jacking points
This is the most expensive thing to get wrong. Bubbling paint or soft metal at the jacking points means the inner sill is already affected.
Check the expansion tank and coolant condition
Look for hairline cracks, brown staining at the seam and around the level sensor, and cloudy or rusty coolant. Ask for invoices covering radiator, water pump and thermostat.
Listen for VANOS rattle with the engine warm at idle
A metallic chattering from the front of the engine, plus a lumpy idle or a flat spot below 3,000 rpm, points at worn VANOS seals.
+ 8 more checksShow less
Brake gently from about 100 km/h and feel the steering wheel
A side-to-side shimmy that appears only under braking is the classic worn front thrust arm bushing symptom.
Look behind the oil filter housing and along the accessory belt
Oil on the belt or the alternator means the oil filter housing gasket is leaking. Price the repair in before agreeing anything.
Check every segment of the instrument cluster and OBC display
Missing pixels are cheap to repair, but they tell you the car is at the age where the blower resistor, window regulators and light module follow.
On 1998-on cars, check the DISA intake flap for play
Free play at the flap, or a rattle on acceleration with a mid-range torque dip, means the valve is worn. Cheap to replace, expensive to ignore.
On automatic cars, ask for gearbox fluid and filter evidence
BMW called the fill a lifetime one. Feel for shudder at light throttle around 60-80 km/h and for delayed or harsh shifts.
On 1996-1997 cars, get a compression or leak-down test
Early European M52 blocks used Nikasil bores. High oil consumption, poor cold running and low compression are the warning signs.
Verify the driver airbag campaigns on 1998-2003 cars
Two BMW driver airbag actions cover this build window, campaign 0032930200 from December 2019 and the 2026 Takata PSDI4 action, and both are often still outstanding. Check both with the VIN before purchase.
On Touring models, check the rear ride height and dampers
Tourings fitted with self-levelling rear suspension can sit low or lose height in use, and those units are considerably more expensive than plain dampers.
Recalls and Technical Service Bulletins
Driver front airbag inflator can rupture and eject metal fragments after years of heat and humidity. Applies to E39 built 7 April 1999 to 10 December 2003, principally cars whose steering wheel or driver airbag module was replaced during service (BMW campaign 0032930200, successor to campaign 0032480200; KBA reference 009376; EU Safety Gate alert A12/00017/19, published 20 December 2019; 22,553 affected vehicles registered in Germany)Critical - verify completed
Takata PSDI4 driver airbag inflator can rupture under age, heat and humidity and eject metal fragments into the cabin. Applies to E39 cars fitted with an affected PSDI4 inflator and carrying production dates from 9 November 1998 to 19 December 2003. Fitment is equipment-dependent, so whether an individual car is inside the campaign has to be established from its VIN (European campaign SR/00581/26, published 2026)Critical - verify completed
The E39's 1990s campaigns were closed decades ago, but both driver airbag actions above are recent, one published in December 2019 and one in 2026, so a large share of cars that have changed hands since then have never been presented. Both depend on which airbag module a particular car actually carries. Contact a BMW dealer with the VIN, or use the Kraftfahrt-Bundesamt recall database, to confirm each of them has been carried out on a car inside the affected build windows.
Warranty Status
Factory warranty (BMW Germany: 2 years for cars bought from 1 November 2001)Expired on every E39
Body perforation cover (6 to 12 years depending on market)Expired on every E39
Extended manufacturer warrantyNot offered by BMW on cars of this age
Third-party used car policyRarely available above 20 years; wear, corrosion and pre-existing faults are excluded
Statutory liability for defects (Germany)Dealer sale: 2 years, reducible to 1 year for used cars by agreement. Private sale: normally excluded
Every E39 520i is now between roughly 22 and 30 years old, so no manufacturer cover of any kind remains and none can be reinstated. In Germany a dealer sale still carries statutory liability for defects, which can be shortened to one year for a used car by agreement, while a private sale normally excludes it entirely. Plan to fund repairs yourself, and treat recent invoices for cooling system, VANOS or front suspension work as worth more than any warranty promise.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
