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I change mine every 5,000 miles, the mid ground between 3500 and 7500 miles as stated in most owner manuals. I drive some in town and mostly out on the highway or freeways. So far when doing an oil change the oil is still clear but a dark amber color. I get a change for about 30 bucks and most of the time they let me into the pit to give the underside a look-see. I used to do it myself (for about 20 bucks) but it's getting harder and harder to crawl under anything any more.
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 1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)
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