Idea for this thread came to me after seeing a documentary on the 1958 Cadillac Eldorado Brougham, then seeing a 80's review of the Cimarron, then seeing a road test of the 2017 CT6. We all know that American upscale and premium car brands, Cadillac, Buick, Lincoln, Mercury, and Chrysler occupied a much higher tier in the car market back in the 50's and 60's compared with nowdays. To a lot of folks, the 58 Eldorado Brougham and 59 Eldorado Biarritz Convertible were the definitive Cadillacs. I personally regard the 30's V16s as the greatest cars from the Cadillac brand. But those 50's and 60's big Caddys are a lot more recognizable to most people, and are greater cultural icons in my opinion. From a similar perspective, the 1956 Lincoln Mark II coupe and the 1964 Lincoln Continental sedan are the definitive Lincolns. A lot of people are going to say that the oil crisis of the early 70's caused the American luxury car brands going down market. This is a important reason, but far from the only reason. The mid 70's Imperials, and the late 70's Caddys and Lincolns are priced right up there with best from Mercedes if not higher, and they sold in decent numbers with the exception of the Imperials. The 71-78 Eldorado, the 76-79 first gen Seville, the 77-79 Mark V, they were quite expensive for its day, and sold well. The only American luxury cars that sold poorly back then were the Imperials from Chrysler. So it seems the energy crisis didn't drive buyers away from these big land yachts. The 70's domestic land yachts are actually bigger than the 60's ones, sometimes much bigger. The first gen Seville was the first successful product of the so called "down-sizing", but it was an oddity of its time. If the 75 Imperial or the 77 Eldorado or the 79 Mark V get any bigger they would need their own ZIP codes. Even the "compact" Seville was larger than the Mercedes S-Class from the same era. If I remembered correctly, the 58 Eldorado Brougham was the most expensive car of the 50's. And the 59 Eldorado, especially the Biarritz convertible, while not as prestigious as the former, was still almost as expensive as Rolls Royce of the same era. In the 60's Lincoln Continentals and the Imperials by Chrysler were quite expensive too, you would need to be a doctor or a lawyer to be able to afford one. By then Mercedes already had plenty of prestige with the 600, but Audis and BMWs were no were near the level of prestige they have today in the luxury car segment. It seems by the 70's, poor quality control, making vehicles people don't want, and other more complicated factors have lowered brand perceptions. Correct me if I'm wrong, but the disaster with the Cimarron in the 80's has its lingering effects even today. In some ways it permanently lowered the brand perception of Cadillac and American luxury car brands in general. Recent years there has been attempts to move up market by Lincoln and Cadillac. The Continental and CT6 are very good cars for the price range, but still couldn't compete with S-Class or 7-Series. And with the shrinking sedan market, we are not sure if they will make more expensive flagship sedans. So the people here with far more knowledge than me, maybe you guys will enlighten me with some expert information and opinions.