By Christina Amann and Alexander Hübner
MUNICH, March 12 (Reuters) - Volkswagen will make the sale of a majority stake in its Everllence subsidiary contingent on holding company Porsche SE PSHG_p.DE becoming a co-investor of about 10% in the maker of large marine engines, two sources familiar with the matter told Reuters.
While VW has for months been seeking competing bids for Everllence, it has not been previously reported that Porsche SE - the Piech and Porsche families' investment vehicle that controls the VW group - would be a shoo-in for a smaller stake.
Six financial investors have advanced to the second stage of bidding for 51% of the shares after making offers that value all of the maker of large diesel engines and industrial heat pumps at about 8 billion euros ($9.25 billion), the people said.
A deal is expected by summer, they added.
VW and Porsche SE declined to comment.
($1 = 0.8653 euros)
(Writing by Ludwig Burger, Editing by Miranda Murray)
((ludwig.burger@thomsonreuters.com; ))