Back in 1980, looking for a bigger car to carry my growing family, I bought a 6 cylinder Triumph 2000 which then was 6 years old. Absolutely loved it, and although they had only been out of production for 3 years, scrap yards were full of them, and parts were plentiful. The 2.5PI model was often scrapped due to the lack of understanding of the fuel injection system, which if wrongly set up gave horrendous consumption figures, but that has led to them now being sought after models today due to their relative rarity. I got the bug in 1980, and currently have 5 various models in the range, which I take to shows.
I got the Omega bug for similar reasons back in 2001 after buying my first 3.2 Elite, as I wanted a heavy powerful rear wheel drive car for towing. I've since collected quite a few to say the least

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What I am trying say is that in my early days of Triumph ownership, I quickly found out the problem areas for rust, and did something about it with rust preventative measures. Today, they have virtually no signs of rust at 40+ years old. As I felt my Omegas were were long term keepers, I have done the same wth them - noted where the rust prone areas were on other cars, and did something about it in mine. As a result, I only bought a replacement Omega that had as near perfect bodywork as possible, and then set about preserving them as best I could. Today, all my Omegas have perfect rear arches, and are showing no signs of rust. I'm not saying that they will never rust, but the process can be minimised with suitable treatment. It's pointless putting good money into an example that already has rusty arches, for example, as fighting the tin worm is a never ending battle once it's there.
I believe that good Omegas, especially the higher spec'd models are now getting quite sought after, and in a few years time, will no doubt be quite a rare car. The value of them has already bottomed out and will surely continue to rise. Good examples can still be found if prepared to wait for the right car and maybe pay that bit extra for it, but then take the right precautions to keep it as rust free as possible for as long as possible.
I also have a high performance Audi, and although it's a tremendous car, overall I enjoy the Omega more for what it offers.
Maybe the Omega Elite will some day be like the Triumph 2.5 PI - once a car scrapped prematurely, but years on, a rarity and quite a classic in its own right!
All said, I intend being an Omega owner for some considerable years to come!
Sorry about the length of this post, but keeping a possible future classic car on the road to me is important and I will be doing so for as long as possible with the Omega!
John.