Vulcar Marine is an aquatic vehicle engine manufacturer that appears in GTA 6.
It was confirmed to appear in Trailer 2, where a banner for the company can be seen in 
The business appears to be owned and operated by Vulcar, a Swedish vehicle manufacturer that has appeared in every Grand Theft Auto title since GTA 4.
Although Vulcar Marine has never appeared in a Rockstar Games title before now, its connection to its parent company suggests that it is also adheres to the high-safety standards that the Vulcar name is known for.
As Vulcar is based on the real company Volvo, it stands to reason that Vulcar Marine is based on Volvo's marine engine division, Volvo Penta.
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