The investment is to split equally between the two companies, and the deal will see GMG's North West regional titles printed there from early 2006.
The new equipment, to be installed between October 2005 and June 2006, will increase the colour and inserting capability of the companies' titles.
Sly Bailey, chief executive of Trinity Mirror, said: "This collaborative approach will deliver great value for all concerned. Both parties will benefit from what will be the most advanced printing presses in the world. The joint investment will enable Trinity Mirror to deliver a better service to readers and advertisers while significantly reducing the cost of re-pressing at the Oldham site."
The GMG titles, which are published by its subsidiary Greater Manchester Newspapers, include the Manchester Evening News, Manchester Metro News and the Express, Reporter, Observer, Times and Advertiser series of local newspapers in Greater Manchester.
The early edition of the Manchester Evening News is already printed at the MCP Oldham site. The other GMG titles will be transferred from two other sites as capacity becomes available.
Ian Ashcroft, chief executive of GMG Regional, said: "The move to Oldham means all GMG's regional newspapers in the North West will be printed at the same plant. Combining with MCP maximises efficient use of pre-press, press and post-press capacity and has facilitated purchase of equipment to the highest technical specification in a plant with a proven track record."
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