GTA? Just get a gallon of 20wt way oil from any industrial supplier. KBC is an easy ecommerce buy. . Way oil just means it has tackifiers in It that make it sticky so it hangs around longer. Its about the least critical application there is. Low speed, low heat, low pressure etc so don't fret that its not exactly the name the manufacturer lists. To a great extent if not 100%, the way oil brand/make machine manufactures recommend is highly dependent on who offered the best OEM deal, part of which is being listed in the BOM. If the oil is decent quality, the right viscosity and the right additives for the intended purpose I don't worry about the brand (contrary to billions in advertising dollars spent trying to change my mind).