Alfa Romeo’s 166 is the worst depreciating car in the UK, retaining 14.4 per cent of its original price after three years.
Rover and MG cars, such as the 45/ZS and 75/ZT, fare little better, holding on to 20 per cent of their values over the same period.
Models from a number of other manufacturers feature in the bottom 10 - including Proton, Mitsubishi and Nissan - and none of these achieves a residual value better than 25 per cent.
The findings come from analysis by Glass’s Guide of the values of all three-year-old cars available in the UK - over 6,500 model ranges in total.
Adrian Rushmore, Glass’s Guide managing editor, said: “None of the bottom 10 models is currently in production. In fact, for almost all of them the last year they were available to buy as new cars was 2006.
“The used-car market has been offering these models for many years and they have been overtaken by a younger generation of cars with more stylish, modern designs. In the case of Rover/MG-badged cars, it’s not just the models that are obsolete - even the manufacturer has gone.”
He added: “Many consumers would struggle to identify models like the Proton Impian and Mitsubishi Space Star. These cars sold in very limited numbers when new and, having failed to attract buyers then, will suffer from similarly low levels of demand as used vehicles.”
However, Rushmore said these badly-depreciating cars represent great value for money to would-be buyers.
For example, a three-year-old Rover 45 could be purchased from a dealer for around £4,000 - some £2,500 less than an equivalent Ford Focus and £3,750 less than a comparable Volkswagen Golf.”
The 10 models which retain the least of their original list price (as a percentage) after three years and 39,000 miles are as follows:
1. Alfa Romeo 166, 14.4%
2. Rover 45 / MG ZS, 20.3%
3. Rover CityRover, 20.4%
4. Rover 75 / MG ZT, 21.3%
5. Proton Impian, 22.0%
6. Mitsubishi Space Star, 22.5%
7. Nissan Terrano, 22.9%
8. Alfa Romeo 156, 24.2%
9. Renault Laguna, 24.3%
10. Cadillac CTS, 24.8%