Featuring Ronald Isley on lead vocal, "This Old Heart of Mine" peaked at #12 on the Billboard Hot 100, and at #6 on the Billboard R&B Singles chart. The single was the group's only major hit while on Motown, and in 1969 the Isleys left Motown to restart their own T-Neck label. During the same year, Tammi Terrell recorded and released the song as a part of her Irresistible album. In 1976, Rod Stewart released a remake of this song that met with some success. Twenty-four years after the original recording, Ronald Isley and Rod Stewart released a Top 10 duet version of the song in 1990 that reached #10 on the US Billboard Hot 100 chart and spent five weeks at #1 on the US adult contemporary chart. The Dutch girl group Luv' recorded a dance cover version of "This Old Heart of Mine" in 1992.
The 1991 album Sincerely Yours and the singles released from it were far from being hit records, though the female pop formation was frequently invited to perform live at clubs and discos. Because of the lack of commercial success, Luv' and RCA Records/BMG ended their legal relationship. The trio later signed a contract with the Dutch label JAM for the release of one single in 1992, a Dance cover version of "This Old Heart of Mine (Is Weak for You)" (originally performed by The Isley Brothers. Luv's rendition of this Motown hit failed to top the charts. This attempt to cover a song from the Holland-Dozier-Holland repertoire is not the first one for Scheide, one of Luv's members. In 1983, she recorded as a solo artist a Supremes medley that was aired on Black American radio stations despite its disappointing record sales.
Soon after promoting "This Old Heart of Mine", the group disbanded. One year later, the original formation (José Hoebee, Patty Brard and Marga Scheide) reunited and returned to the Dutch albums and singles charts.