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Yes you can switch back, but I don't know why anyone ever would.
The synthetic does NOT break down with heat and you can safely go 5k between changes, and many go even farther. Not breaking down with heat is a big deal with these new cars, as most have a hot thermostat to help with the emissions.
I have always been that guy that changed every 3k, so this has been hard for me to wait, and I have even changed the synthetic many times at 3k. I still do every spring and fall, as I don't want the corrosives sitting in the oil pan.
You can go to Walmart any day of the week and buy a 5qt. jug of Mobil One for about $25.
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