Answer depends on whether you believe in it or not. Some do.

If you are referring to the injector cleaner, adding an oil to my gasoline is not on my list of things I would inflict on my own vehicle.

If you are referring to the oil stabilizer, adding a non-synthetic low-tech petroleum oil to my oil sump (at ratios of 20% to 80%), is also something I would avoid. I would consider adding it to a noisy manual gearbox, which it is recommended for, as an alternative to sawdust. That's a joke, btw.

I am not sure if Lucas have other products besides those two.

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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