> <<I always do that with my freight trains! Doesn't seem applicable to my > cars. Almost all automobile engine wear is cold start wear.>. > I have a Porsche 911 factory shop manual from 1968 that states that startup wear is equivalent to 200 miles at full throttle. Keeping in mind that all their engines were air-cooled in those days and top speeds were in the range of 130-140mph.
So here they are endorsing Mobil1 0W40 more than thirty years before it was introduced. RLE > >
