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Is ligroine the same as light naphtha/petroleum ether?

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eggs:
I am trying to make a DIY version of Seafoam*, an internal combustion engine fuel additive that can clean the engine on the inside. It is added to the fuel tank (although other applications also exist) and ends up in various parts of the engine.

There are three ingredients:
-pale oil (I understand diesel can be used),
-isopropyl alcohol (easy to find)
-petroleum ether (also easy to find, but which to choose?)

For this latter ingredient the product MSDS lists CAS number 64742-89-8, which is described as 'Solvent naphtha, petroleum, light aliphatic'. I'm having a hard time sourcing this exact compound. The closest thing I've been able to find is 'ligroine' (CAS 8032-32-4), which has the same boiling point, density, vapor density, vapor pressure and refractive index. So I think its the same, but if not, what form of naphtha would be a better substitute? Its function is to remove/soften/solvate carbon deposits and other caked stuff inside the engine.


*For the curious, some background info on the Seafoam product: https://hildstrom.com/projects/2010/01/seafoam/index.html

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