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.[1]
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.[1]
In 1994, Electromecon Onești merge with CSM Borzești to form FC Onești. This merger took place at the initiative of Nicolae Puiu, the president of Electromecon with the support of Simion Albu – manager at that time of RAFO – and of Ion Marian – the leader of the "Rafinorul" syndicate.[2]
In the following three seasons, FC Onești performed in the second division, each time occupying a place in the first half of the standings.
In the first season, the Group from Trotuș finished in 5th place, in the second, Oneștenii ranked one position higher in 4th place, and in the summer of 1998, FC Onești promoted for the first time in Divizia A as a result of the 2nd place at the end of the season (after a fierce battle with Astra Ploiești, the series winner) and the win in the promotion play-off match, held at Nitramonia Stadium in Făgăraș, against Electroputere Craiova 2–1 through the golden goal of Ionel Iriza. The team coached by Professor Toader Șteț was composed of: M. Floria, B. Mandric, V. Jercălau, L. Achim, A. Artimon, I. Pârvu, A. Masati, C. Moldoveanu, Fl. Munteanu, L. Urâtu, Cl. Goiceanu, C. Bârsan, G. Gorga, I. Iriza, C. Decu and D. Oprea.[3]
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.
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.
