Demonoil is an engine lubricant company that appears in GTA 6.
The company first appeared in GTA Online, where it is shown via in-game advertisements in the Arena War gamemode.
However, Demonoil isn't technically new to the streets of Vice City.
The company has its own model calendar in Grand Theft Auto: Vice City - The Definitive Edition, retroactively adding it to Leonida's history.
It was confirmed to return in GTA 6 in Trailer 2, where a Demonoil sticker can be spotted on a tool cabinet in 
The company's tagline is: "Driving without lube is hell."
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