E
ngine specifications remained the same as previous year for all models.
The exterior and interior where also unchanged compared to late 1987 models.

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This picture show the interior of a 1988 M6 US version of M635 CSi.
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The rear seat air conditioning option, that where introduced 1986, is still an option in 1988. It was a popular option and could be found in a majority of the late 6 series cars.
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US 635 CSi
19881989 was the years the US 635 CSi model had the new 3.5L engine with 208 hp and 225 lb.ft torque.
Comments & facts
Adrian: I've noticed that some (or most) European models have the brake-light in a different location vs. the US ones. All US models are above the reverse light. Euro models tend to use the area above the tailight next to the blinkers/indicators. I'm assuming the Euro tailights then use the rear-foglights where the US brake bulbs would be.
Production numbers for 1988
|
Model
|
Units
|
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635 CSi
|
48
|
|
635 CSi A
|
21
|
|
635 CSi RHD
|
20
|
|
635 CSi A RHD
|
352
|
|
635 CSi Cat
|
250
|
|
635 CSi A Cat
|
280
|
|
635 CSi A Cat RHD
|
49
|
|
635 CSi USA
|
185
|
|
635 CSi A USA
|
1643
|
|
635 CSi A Japan
|
381
|
|
M635 CSi
|
28
|
|
M635 CSi RHD
|
31
|
|
M635 CSi Cat
|
43
|
|
M635 CSi USA
|
319
|
|
M635 CSi Japan
|
16
|
|
Total:
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3666
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Source: Bmwcoupe.nu