Those three petroleum products they reference are:

1) light mineral oil (not a synthetic) of unknown properties
2) naptha, properties not specified, but something usually associated with lighter fluid and white camp stove fuel
3) rubbing alcohol

Three things I wouldn't put in a modern engine, especially when they displace the required synthetic lubricating oil. Hence my reluctance to use it. Also the reason that BMW specifically advise against using such additives.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue