Car production dropped by 4.9% in May 2011 compared with the same month last year, according to figures released the Society of Motor Manufacturers and Traders (SMMT).
UK car firms manufactured a total of 99,280 units during the month. The study also showed a 5.0% decline in commercial vehicle (CV) production to 10,205.
However, car production remained up by 4.6% over the first five months of 2011 to 542,816.
Meanwhile, CV production fell by 5.55% during the January-May period this year, totalling at 50,995.
In May, engine production rose by 4% year-on-year to 214,218, and was up 5.6% compared with the first five months of 2010.
The motor industry has been boosted recently by major investment announcements in UK plants by various companies including Nissan and BMW.
SMMT chief executive Paul Everitt said: "Recent announcements demonstrate the commitment being made by global vehicle manufacturers to the UK motor industry. These will secure future production and jobs, as well as opening up new opportunities for the UK-based supply chain."
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