Hello Naj,
This is the BBB for the earlier models (1959 through 1966). I have this manual also. It does have some specific information for the 230-SL not covered in the later BBB (1966 through 1973). Complete information on all W113's (230, 250, 280 SL's)would need information from both of these BBB's.
Joe Alexander
Blacklick, Ohio