Mercedes-Benz S-Class Buyer's Guide

The S-Class is sixty years of Mercedes flagships in one listing category, and our three sold results tell the whole story in miniature: £35,438 for a 1989 560 SEL, £4,088 for a 2009 S320, and £1,120 for a 1983 280 SE. The old ones are appreciating classics, the newer ones are the cheapest way in Britain to buy this much engineering, and the same badge covers both.

Know your generations

The W108/W109 (1965–1972) are the elegant Sixties cars, from the 250 S to the legendary 300 SEL 6.3; an active lot in our data estimates a 1969 6.3 at £45,000 to £55,000, well above the ordinary saloons. The W116 (1972–1980) introduced the S-Class name properly and peaks with the 450 SEL 6.9. The W126 (1979–1991) is the one the market has decided on: 280 SE through 560 SEL, plus the C126 SEC coupés (1981–1991); our top result, £35,438 for a 1989 560 SEL, and active lots like a 500 SEL estimated at £39,000 to £48,000 and a 500SEC offered at £12,700 show where the heat is. The W140 (1991–1998) is the over-engineered colossus; the W220 (1998–2005) the flawed successor; the W221 (2005–2013) the return to form, represented by our £4,088 2009 S320; the W222 (2013–2020) and current W223 complete the line, with AMG versions (S55, S63, S65) threaded through every modern generation.

What to pay

Three sales from £1,120 to £35,438, median £4,088. The tiers our data supports: modern diesels and V6 cars (W221-era) around the £4,088 result, with active estimates of £6,000 to £8,000 for a 2013 S350L and £9,000 to £12,000 for a 2009 S600L; rough classic-era cars at four figures, as with the £1,120 1983 280 SE; and collector-grade W126 V8s from the £15,000 to £17,000 estimate band up through our £35,438 result and the £39,000 to £48,000 estimate on the best 500 SEL. AMG W221s carry a premium over their plain siblings: a 2010 S63 is estimated at £20,000 to £30,000 against ordinary-car money elsewhere in the list.

What goes wrong

Each generation has its signature failing. W108/W116: structural rust in floors, subframe mounts and arches; everything is repairable, at cost. W126: the most durable of the lot, but check sills, jacking points and front wings, and on the SEC the rear screen surround; engines are near-immortal with oil changes. W140: the mid-nineties cars suffer the infamous biodegradable engine wiring loom, a known and costly replacement, plus complex vacuum and climate systems. W220: the rust generation, front wings and arches especially, plus Airmatic suspension failures; the cheapest S-Class for a reason. W221: much better built, but Airmatic components, injectors on diesels, and the M272/M273 balance-shaft and timing issues on earlier V6/V8 cars need history checks; the S600 and AMG cars concentrate expense in proportion to their output. Across all moderns, a full file matters more than mileage.

Our view

The W126 is the S-Class to own as a classic and our data already prices it that way: durable beyond any rival of its era, supported by the factory's classic parts operation, and led by the 560 SEL and SEC coupés. At the other end, a W221 around our £4,088 result is absurd value per kilogram of engineering, provided you budget for Airmatic and buy on history. The W220 is cheap because it rusts; we would pay the W126 premium instead.