A neighbor of mine owned a BMW 633CSi for many years. I think all 6-series coupes from the seventies and eighties are good-looking, but this one was exceptionally attractive, with a dark blue exterior and a tan interior.
“A conspicuous exception”
For the 1983 model year, BMW changed the platform of the 6-series coupe in North America. This substantial update—the first since the introduction of the series in 1977—resulted in changes to the exterior styling, the engine, the chassis, the suspension, the electronics, and the interior. These changes still left the 633CSi both very recognizable to and quite comfortable for its intended market.
BMW updated the 633CSi’s engine to the M30 181 bhp 3.2 liter/196 ci inline six with Bosch Motronic fuel injection. This engine was available with a standard wide-ratio five-speed manual or an optional automatic. With an 18.5-gallon gas tank, the fuel economy rating of 19 city/29 highway mpg meant a range of between 360 and 400 miles with a 10% fuel reserve. 0-60 mph came in about 8.5 seconds—competitive performance for a luxury coupe in 1983.
The updated front suspension featured double-linked struts, making the big coupe less likely to dip under hard braking. The new rear axle assembly added a top-mounted link to the trailing arm layout of the E28 528i. BMW replaced the ventilated rear disc brakes seen in previous years with solid ones in a token bid at simplicity.
The 633CSi’s base price was $39,210—about $103,900 in today’s dollars, and about 18% more than a base 2021 840i coupe goes for. Notably, this price was still less than it’s putative German competition; a 1983 Mercedes-Benz 380SEC was almost $15,000 more. Standard exterior and mechanical equipment included quad headlights with halogen high beams, power steering, four-wheel power disc brakes, and 205/70R14 tires (a size still readily available) on 14 x 6.5 inch light-alloy wheels.
Inside the 633CSi, BMW paired leather reclining front bucket seats with leather rear bucket seats. Other interior accouterments included air conditioning, power heated side mirrors, power door locks, a three-spoke leather-covered steering wheel, and a digital clock.
BMW would build the 6-series coupes through the 1989 model year. Like many BMWs, the 633CSi does attract collector interest, and there is series-specific club support along with that of the bigger BMW car clubs. 633CSi’s are often available in the Hemmings Motor News classifieds and on eBay Motors, and they sometimes show up at auction. As I write this post, an Atlantic Blue Metallic 1984 633CSi with blue leather seats and 231,000 miles is for sale on Hemmings for $6,900 firm.
Make mine Lapis Blue, please.