Try a slightly heavier - but light oil - and see how u go on with that!
Thought of that but it is merely masking the symptom and not addressing the problem. The piece is anodized, thereby making it harder but that coating may only be 5 or 10 thousandths of an inch thick and I've already eaten through that into the softer aluminum underneath.
It's goin' down....
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.