Cost & Ownership Comparison
The W223 is cheaper to run than the W222 over a typical five‑year period, despite its higher purchase price, due to the OM654 engine's superior fuel economy. The W223's better fuel economy saves around £500–£800 per year compared to the OM642 V6 diesel W222, and its more modern emissions systems mean lower VED. The W222's lower entry price is tempting, but the risk of OM642 swirl flap failure (£500–£1,200), M278 timing chain adjuster work (£3,000–£5,000) and air suspension failures (£1,000–£2,000) can quickly add up. The W223's early‑model issues are mostly software‑related and less likely to be catastrophic. Over 50,000 miles, the W223 typically costs its owner £1,500–£2,500 less to run than a V6 diesel W222, making it the more financially sensible choice for buyers who can afford the higher initial price. For those on a budget, a well‑maintained W222 is still an excellent flagship.
| Metric (5 yrs, 50k miles) | W222 (OM642 diesel) | W222 (OM654 diesel) | W223 (OM654 diesel) |
|---|
| Fuel cost | £7,800–£8,600 | £6,000–£6,600 | £5,600–£6,200 |
| Servicing (scheduled) | £1,200–£1,700 | £900–£1,300 | £900–£1,300 |
| Tax (VED) | £1,000–£1,300 | £600–£800 | £500–£700 |
| Insurance (estimated) | £2,800–£4,000 | £2,200–£3,000 | £2,500–£3,500 |
| Total estimated | £12,800–£15,600 | £9,700–£11,700 | £9,500–£11,700 |
These figures are [ESTIMATED] based on UK market data and our proprietary enquiry patterns. Actual costs vary by driving style, location and individual vehicle condition.
