On December 27, 1988, CISL shifted to a full-time oldies format, with its playlist featuring music from 1955 to 1975. The new format helped CISL become a major player in the Vancouver radio scene. The original Richmond community programming expanded to include all of the Lower Mainland. CISL enjoyed its greatest ratings and sales success from 1986 to 1989. In 1990, South Fraser Broadcasting was issued an FM license, which went on the air as CKZZ-FM the following year. CISL and CKZZ were sold to Standard Broadcasting in May 1996.