In message , Douglas Payne
writes

I am not a ford expert, but IIRC there's an issue with some ford
engines as fitted to Mondeos and Focuses where a valve or 2 will stick
if you don't use exactly the right spec of oil.

That was on the original silvertop zetec engines. They got that sorted
by the time the blacktop zetec went into the Focus.

--
Paul Giverin

My Photos:- www.pbase.com/vendee