The successor of 3.0CS coupe was born as 630CSi first,
then with engine displacement diversified to 2.8, 3.3
(exclusively for the US market) and then 3.5 liters.
Among them, 635CSi had the best engine and comfort. It
may not be as fast as 3.0CSi, but it emphasised more on
luxury and refinement, just like other modern cars.
Build quality was good while rear seat room was better
than most 2+2 and approached a 4-seater. In 1983, that's
mid way of its life span, the hottest M635CSi launched.
Powered by a 3.5-liter 24-valve engine derived from M1,
it became a hot performer, though I still prefer the civilised
635CSi.
It may not be the greatest of BMW classics, neither today
nor in the future, but the precise handling and sense
of involvement lost in the current 8-series make this
car very memorable.
