Oil is oil, hehe.
Synthetics are great in a racing motor, or one that the oil gets changed very fequently. The synthetics have problems if you run them in a street engine. They don't like water and do not suspend combustion byproducts very well. This causes some really nasty looking sludge to build up. Synthetics should not be used in a motor that is run for short periods that doesn't have time to reach operating temps. Also they should be changed every 3000 or less miles. Other than that synthetics are great.
If you would like more info on synthetics, call Mobil and ask them why they no longer make a synthetic oil for aviation piston engines. Then ask them how many millions they paid out to repair the damage.
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