I own a 9-5, so I am trespassing, but.... I recently came across a Web Site which had an exhaustive analysis on engine oil - when to change it, how it is graded, are additives any good, why oil degrades, what causes most engine wear etc. Highly informative and very useful. It had similarly...

I own a 9-5, so I am trespassing, but.... I recently came across a Web Site which had an exhaustive analysis on engine oil - when to change it, how it is graded, are additives any good, why oil degrades, what causes most engine wear etc. Highly informative and very useful. It had similarly...