Mineral = Short life oil
Synthetic = Long life oil
Both are the same at lubricating your engine, its the different additives in the oil that make one oil better then another,
truth about oils is this, synthetic is better cause it will last longer but mineral is better cause its cheaper, mineral change every 5k, synthetic every 10k, synthetic is twice the price of mineral
see where im going with this.. what ever oil you choose just dont let it get past the point where its properties are no longer functioning as they should, and that will depend on the oil, how you drive, how old your engine is, your ring condition meaning how much carbon your oil is removing from your cylinder walls. Did you get your oil temp over 100C if yes then change it, some oils are better at withstanding higher temps. on and on and on, i think you get the point