Jan 1980 3453cc 635CSi Introduced with sports suspension, metallic paint &
TRX alloy wheels.
Sept 1980 2788cc 628CSi Introduced into UK.
Jun 1982 635CSi receives 3430cc engine from 735i.
Sept 1983 635CSi fitted with standard on-board computer, leather upholstery &
electric sunroof.
Jan 1984 628CSi Specification upgrade includes front fog-lamps. metallic paint
& electric sunroof optional.
Oct 1984 628CSi & 635CSi receive color-keyed interior, electric
seats (memory
optional), sports steering wheel & standard ABS. 635CSi receives upgraded on-board
computer.
Sept 1985 Side repeater indicators on all models, M-technic rear spoiler standard
on 635CSi.
Sept 1986 635CSi fitted with sunroof wind deflector. Switchable auto gearbox is a
no cost option.
May 1987 628CSi Special order only (UK).
Sept 1987 635CSi gets color-keyed bumpers & spoilers, elipsoidal headlights
& foglights, full leather upholstery (on "highline" designated models), air
conditioning, green tinted glass & memory electric front seats as standard.
Sept 1989 635CSi Discontinued.
6 Series Model Range
Model
Engine
Max Power
Top Speed
0-60 MPH
Fuel Consumption
633CSi
3210cc SOHC I6 efi
197 bhp
133 mph
8.1 sec
20.6 mpg
635CSi ('80 - Jun '82)
3453cc SOHC I6 efi
218 bhp
138 mph
7.4 sec
17.5 mpg
628CSi
2788cc SOHC I6 efi
184 bhp
132 mph
8.5 sec
25.0 mpg
635CSi (post Jun '82)
3430cc SOHC I6 efi
218 bhp
142 mph
7.2 sec
21.6 mpg
M635CSi
3453cc DOHC I6 efi
286 bhp
158 mph
6.1 sec
17.0 mpg
6 Series Buyers Notes
Front body work should be checked for stone-chips, rust & evidence of poorly
repaired accident damage.
Check that service indicator & warning indicators are working as they should.
Check the fan coupling isn't seized, the Motronic air-flow sensor is working and that
the head gasket is ok.
Check that there is no black oil smoke, oil leaks on engine, clattering camshaft, noisy
cam chain or worn valvegear.
Check for worn propshaft bearing, perished hoses, collapsed offside engine mount ( and
subsequent forward tilted engine block & misaligned air intake ).
Worn or noisy manual gearbox bearings, stiff gearshift action, damaged propshaft/Gearbox
couplings & loose or leaking diff.
Check for worn steering box and broken mounting bracket to subframe.
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