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Message: <blockquote data-quote="Shadowrider" data-source="post: 4134448" data-attributes="member: 3099">Depends on the car. Or at least it used to. I bought a 2002 Monte Carlo and the oil life monitor actually used several different things to calculate it. It would vary from 4500 to 8000 miles depending on how I drove it. My dad bought a several years newer model Mercury Mountaineer and it was a straight up mileage counter. My even newer 2017 Subaru was also a mileage counter.I've been running Amsoil synthetics for almost 30 years now. I was driving the '02 Monte Carlo enough that it would have needed to have the oil changed every two weeks sometimes if I wasn't running extended drain synthetic oil and primo filters. With a filter change and top off along with oil analysis I was able to get 30,000 out of one change. I usually just ran it to around 20-22K miles and changed it. I drove that car until it blew a head gasket or cracked a head at 250K mikes. It still ran like new, just couldn't keep coolant in it.These days I just change it once a year and I'm never even approaching the milage, maybe 3K a year now.</blockquote>