Demonoil

Demonoil is visible in Grand Theft Auto VI’s second trailer at 2:31. Its logo appears as a sticker attached to a tool cabinet inside Brian’s Boat Works & Marina. This is the specific GTA VI sighting identified for the motor-oil brand; no product range, price, vehicle application, or gameplay function has been shown with it.

The cabinet placement ties the brand to a working marina and repair setting rather than to a dedicated shopfront or roadside advertisement. The trailer image confirms branding within Leonida, but it does not establish whether Demonoil can be bought or used by the player.

Demonoil is presented as an engine-lubricant brand. Its visual identity has been compared with Motul and Havoline, two real motor-oil brands, with similarities in the branding rather than a confirmed direct in-universe relationship. It also has a weaker resemblance to an unnamed Japanese oil company.

The name itself is likely built around “demonoid,” combining that word with “oil.” No manufacturer, oil grade, variant, service price, or performance claim is identified for Demonoil.

Before its GTA VI trailer appearance, Demonoil was also promoted on television screens in the Arena Workshop. These adverts could appear beside the Career Wall, providing a separate placement from the brand’s Arena War sponsorship material.

Its earlier use established Demonoil as advertising and livery branding rather than as a documented purchasable vehicle product.