I was giving the car a wash this afternoon. I had a good look round and I cant see any rust spots at all. Not even a tiny one in the usual places.Now I've heard some horror stories from people with newer cars than mine and the fact that it is rust free is nothing to do with me-just pure luck I guess.
The thing is, a daft question I suppose, but worth asking, is there anything I can use to keep it that way?
It looks great and still makes me smile when the sun is shining on it. I know, saddo

I understood waxoyl was a protection for the underside,brake pipes,etc. I am more concerned about the crusty brown stuff that eventually appears from beneath rubber door seals and from under sill plates.

Shall I have it dipped in an industrial sized bath of wax?

Do omegas rot away more quickly in Fleetwood, Salty?

i have waxoiled my cav convertible, was a pain of a job to do but it only needs doing the once...

did the inside of the doors, chassis legs, sills, the joints between the inner and outer arches and all the box section i could access.....

only thing i would suggest is do it on a warm day, the waxoil is easier to apply, if you do it when it is cold it is recommended to use thinners to water it down a bit

I'd take it back to the dealer and complain... a Vauxhall without any rust definitely isn't normal. Should be fixable under warranty I'd expect 

Mine was virtually rust free when bought....19 months later...Tin Worm heaven