While I can't speak for the 2-stroke oils, I used Valvoline for years in my vehicles and it is one of the best oils. Penrite seems to have a good rep as well. As long as you stick to good brands, you should be fine.
Part of the problem is businesses that don't sell bulk lots and rely on sales of smaller units, ie: bike shops, who have much higher margins, or have to sell at a higher price due to not being able to buy at bulk rates.
You don't get to be an old dog without learning a few tricks.
Shorai Powersports batteries are very trick!
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