I know a 308 gets a 30k, 60k etc major service but, is a 15k major service required as well?
Marc, the 15k is for the basic fluids and valve guides as i recall (and other small bits). It is not just milaeage but also AGE so if the timing belts have not been changed in the past 7 years i would consider doing that as well.
Per Steve's comments, at this stage in a 308's life, age is probably more relevant than mileage. If it has not had a major service in the last 4 years, then it probably is in need of one. There are a lot of different opinions on how often the belts need to be changed but every 4-5 years would be my max.