Actually I have never known this to be much of a problem. Change your oil regularly and don't buy the bottom grade. However, my son is an inveterate car nut who does little else. He has won me over to even modest cost synthetics. He says that he has researched much data where teardowns of car engines on synthetic oils only still show some to most of the cylinder "hone marks" of original specs. That = compression and on spec bearings, chains etc. You know, when you look at the big picture, the price of oil is peanuts.
Now I know I will sound like a grandpa when I say the following.
With reasonable maintenance, bikes don't wear out... they crash out. Go to any bike salvage yard and keep your hat in hand and be ready for tears. You will see many bikes badly rusted and abused and a Great Many in parts because that's all that was left.
Mike from the two stroke era, (YRD350, Kaw H2 750), & asst Dukes)