The rise of the team from Onești began in the summer of
1987 when Mecon, sustained by IUGTC Onești (The Heavy Equipment Enterprise Transport Construction), with Steluș Roșca on the bench, managed to promoted in
Divizia C winning the
Bacău County Championship and the promotion play-off against Chimia Victoria 1–0 on aggregate. With Nicolae Zaharia as coach, he played in the third division in the following seasons, being generally in the top half of the ranking finishing 4th in
1987–88, 5th in
1988–89, 8th in
1989–90 and 10th in
1990–91. Changing its name to Meconerg, the team continued to play in Divizia C and after the reorganization of the competitive system in the summer of 1992, finishing 4th in
1991–92, 5th in
1992–93 and 7th as Electromecon Onești in the
1993–94 season. In
1994–95 season, he took the 2nd place in the Series I of Divizia C behind
Foresta Fălticeni and promoted in
Divizia B defeating
Flacăra Moreni in the
promotion play-off held at
Electro-Precizia Stadium in
Săcele with a score of 1–0 through the
golden goal. In Divizia B, the team from the
Trotuș River competed in Series I, finishing each time in the top half of the table, placing 5th in the
first season and 4th in the
1996–97 campaign. In the summer of 1998, FC Onești achieved its first promotion to
Divizia A after finishing 2nd in the
1997–98 season, following a close battle with series winners
Astra Ploiești, and winning the promotion play-off match held at Nitramonia Stadium in
Făgăraș against
Electroputere Craiova, 2–1, through Ionel Iriza’s golden goal. The team, coached by Toader Șteț, consisted of Floria, Mandric,
Jercălau, Achim,
Artimon,
Pârvu,
Masati, Moldoveanu, Fl. Munteanu, Urâtu, Goiceanu,
Bârsan, G. Gorga, Iriza, Decu and
D. Oprea. At the end of his first Divizia A championship, FC Onești took 14th place out of 18 participants. The following year, FC Onești took the 16th place, a relegated position at the end of the championship. Returned to Divizia B, Onești competed in Series I, finishing 10th in the
2000–01 season and 7th in
2001–02. In the
2002–03 season, the team was initially coached by Jean Gavrilă, but he was dismissed at the end of October, when the team was just one point behind leaders
Politehnica Iași after nine rounds, and he was replaced by Petre Grigoraș, who led the team to a 3rd-place finish. The club was dissolved in the middle of the
2003–04 Divizia B season, after its main sponsor,
RAFO, withdrew its support. The club was refounded in 2009 under the name of FCM Onești. In the summer of 2012, the club was renamed once again, as FCM Dinamo Onești. For three years the club played in
Liga IV. The club was dissolved once again, in 2015. ==Chronology of names==