Ford Motor Co. has extended it's recommended engine oil change intervals from 5,000 miles to 7,500 miles under " normal " use for select new 2007 models, and for all new or redesigned models for 2008... Ford also increased the recommended engine oil change interval under " severe duty " use from 3,000 to 5,000 miles... Change is due to improved engine oils and improved engines- a combination of those two... The 2007 models include Ford's new 3.5-liter Duratec 35 V6 engine...