Why it's a good car
The 2002 E320 is the final model year of the W210 platform — a proper rear-wheel-drive Mercedes executive sedan. Under the hood is the M112 3.2-litre V6, an engine used widely across the Mercedes lineup and one with a well-documented path to 200,000 miles and beyond when it is looked after. It is naturally aspirated, which removes the entire turbo failure tree from consideration, and it is paired with the 722.6 five-speed automatic, one of the more durable gearboxes Mercedes fitted in this era. The complexity on this car lives in the ancillaries, not the engine internals — which is exactly why the conditions below matter.
Does it have a timing belt or a timing chain?
A timing chain. The M112 V6 is chain-driven, so there is no scheduled timing-belt replacement to budget for. The part to watch at the front of this engine instead is the harmonic balancer — covered next.
The things to check before you buy
- Harmonic balancer (crankshaft pulley) The rubber damper ring that bonds the inner and outer sections of the crankshaft pulley can degrade and separate with age and heat. A failed one can cause serious engine damage, so confirm the ring is intact and uniform, or that the pulley has already been replaced. This is the single most important check on the car.
- Transmission fluid and shifts The 722.6 was marketed as "sealed for life," which is not real — the fluid needs servicing. You want clean fluid and clean, prompt shifts through every gear.
- Air conditioning On an older Mercedes in a hot climate, confirm it blows genuinely cold within a couple of minutes. The evaporator is buried in the dash and is the expensive failure on this car.
- Window regulators The single most common W210 fault. Test every window all the way up and all the way down.
- Blower motor regulator A known W210 part that can kill the fan above roughly half power. Confirm the blower actually reaches full speed.
- Coolant expansion tank The plastic tank cracks and weeps with age; check for seeps and staining around the cap and base, and confirm the coolant looks clean.
- Proper diagnostics This era of Mercedes needs a brand-capable scanner (the older 38-pin system), not just a basic code reader, to see transmission, ABS, and airbag faults. A generic reader alone leaves you flying blind on the full health of the car.
What would make you walk
- Coolant in the oil Cream or mayonnaise-coloured residue under the oil filler cap. Walk without negotiating.
- A failing balancer Visible cracking, bubbling, or separation in the harmonic balancer rubber ring, or any wobble in the pulley.
- Cooked transmission fluid Fluid that is black with a burnt smell means damage may already be done.
- A dead A/C system A confirmed evaporator leak on a car of this value is a walk-away-class repair unless the price reflects it entirely.