As Micromaster Combiners, the Metro Squad's vehicles can separate in half and attach with other Micromaster Combiners to form different, specialized rescue vehicles. Commissioned to shield the streets from chaos and destruction! Reinforce Autobot defences by clearing embattled area of debris and fallen Decepticons. Well-respected by fellow Autobots for their fearless courage in the face of danger. Possess an impeccable success ratio in protecting civilians during Decepticon attacks. Unwilling to accept awards for acts of heroism. Satisfied knowing they've helped the fight against evil! Eagerness to aid wounded is overshadowed by ability to get in each other's way. Combine to form fire truck, hovercraft, and tanker truck.
(In the Tech Specs, "Rank" was replaced with "Teamwork" and "Firepower" was replaced with "Cooperation" for Micromaster Combiner Squads.)
Oiler appeared in the following 8 comic books: