Gadge, I was unsure if petrol or your 50/50 would eat at the plastics. I'd didn't think it would, but I didn't want to chance it. Absolute PITA it was. And I read that part in the manual as well!!! Dust seals will be getting grease and not much else. However, would the teeth benefit from a very, very light layer of...something? In the interest of longevity.
Tyler, she'll be looked after. Still unsure which way to go with the "restoration". If I don't paint the deck, perhaps a clear coat to stop the Al from corroding and pitting?
I don't collect mowers. I just require Multiple Mowing Solutions™.