Mitsu & Nissan have taken the first concrete step that I have seen to share services & reduce costs:

Nissan and Mitsubishi Motors join forces to offer financial services in Canada, Australia and New Zealand

Nissan Motor Co., Ltd. and Mitsubishi Motors Corporation today announced the launch of a branded sales finance operation for Mitsubishi in Canada, Australia and New Zealand.

Mitsubishi Motors Financial Services will provide attractive and competitive financing options for customers, making it easier to buy a Mitsubishi. The company, a leader in four-wheel drive and sports utility vehicles, hopes that the new financing arm will attract more buyers, encourage loyalty among customers and provide additional support to dealers.
Full press release: http://www.mitsubishi-motors-pr.ca/c...ia-and-new-zea