- Speedor- Go-On Red's Engine partner #1, a condor / race car, who forms Engine Oh's head, arms, and chest.
- Bus-on- Go-On Blue's Engine partner #2, a lion / bus, who forms Engine Oh's waist and legs.
- Bear-RV- Go-On Yellow's Engine partner #3, a bear / RV, who forms Engine Oh's stomach and the V-Shield.
- Engine Oh Birca- Go-On Green's Engine partner #4, an orca / bike, can attach to Engine Oh's left arm.
- Engine Oh Gunpherd- Go-On Black's Engine partner #5, a german shepherd / police car, can attach to Engine Oh's right arm.
- Engine Oh G6- Combination of Engines 1-6, or Engine Oh and GunBir Oh.
- Engine Oh G7- Combination of Engine Oh, Birca, Gunpherd, Toriptor, and Jetras.
- Engine Oh G5- Combination of Engine Oh, Carrigator, and Jum-bowhale. Despite the name, it is actually at the same power level as Engine Oh G7.
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