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The only parts I've had to replace on my Q50 are the R/R and headlight bulb (a result of the R/R being bad). My nephew has a Rocketa Peace 50cc, and has not had to replace anything. Both are still under 5k, no record, but promising! I have just under 2k miles in four months on my 150cc, and no issues yet other than the exhaust valve being zero tight on delivery. I realize older Chinese scooters had major issues, but newer ones seem much better quality. On a price value basis, you cannot beat a brand new Znen IMHO.

OK here is an article pertaining specifically to motorcycles.
www.motorcycleperf.com/TechTips/BadGasoline.html

Not to argue too much, but the simple fact is, high octane is to prevent knocking in high compression engines. GY6 is not a high compression engine, and I have never heard one knocking from low octane fuel. If you don't hear knocking with regular gas, you don't need a higher octane.

Just to see what would happen, I've been using dollar store 76 brand oil in both my scooters. My 50cc has been running on it for two years with over 3000 miles, and my 150cc is over 1600 miles, and I've been using it since PDI on each of then. Nothing for the record books, but the experiment will continue.

What is more important than brand/type of oil is the frequency of oil changes. My father taught me to always change your fluids more often than the manual says, and his vehicles lasted for decades without needing major repairs. I change my oil every 500 miles in the cold months, and every 300 miles in the heat of summer. It only takes 10 minutes, and using cheap oil it costs less than a cup of coffee, so why not?

To keep any blow by from getting out, keeping everything clean.

Problem is, 2-stroke engines were mainly used in scooters during what we refer to as the unreliable years, late 90's-2009. Around 2010-2012, 4-stroke engines became the norm due primarily to emissions requirements. The quality of many scooter brands also have shown a noticeable rise since then. Part of this (perceived?) increase in quality is due to new factories with better production methods and controls that were built in the early 2000s. Another part is the fact 4-stroke engines are not as rough on themselves as 2-stroke engines, after all they fire half as often.