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Cornfused: Yep - I joined in 06 and I've lurked here for a long time. This is the first time I felt I had something constructive to add to a discussion thread. In the distant past I supported myself as a truck / heavy equipment mechanic . . . but I ended up getting a PhD in pure mathematics (a...

I guess my main point is that one doesn't get to direct the oldest most worn out oil to be what is lost on any 1000 mile run . . . we lose of fraction of the oil 1000 miles old, a fraction of the oil 2000 miles old, a fraction of the oil 3000 miles old and so one with each 1000 miles traveled...

A classic calculus problem here folks. Let's assume a 5 qt system that loses 1 qt per 1000 miles as per the OP. Let's also assume an initial fresh oil change with five new quarts. 1000 miles down the road we lose a quart and we add one new quart to bring the system up to 5. At this point the...