What brand of LPG/GAZ/GPL/ Propane?

I?m not a fan of LPG myself preferring diesel engines (even one of my bikes have diesel engine), but this thirsty beast give me no choice ;-)
What brand of LPG system are you using? Do you use additional lubrications? To protect valves and seats either Flashlube or additional to gaz injections of normal fuel can be used.
According to guys from LPG service there is no need for lubrication on the Vortec engines.
I?m interesting about yours opinion.
My plan so far is use BRC P&D (Italian) installation dedicated for 8 cylinders engines.

Hello,

I use Prins brand and Flash lube valve care
Lpg is no good for head, in the past I have meet the problem with my valve and seat,  seats and valve has been replaced by stellite alloy.

But the system is efficient, lpg is a good carburant and very cheap

I was also considered Prins but they don't have authorised workshop in my place.
I will go for some installation from top components which will be chosen by very good specialists from my town.
In the meantime I join LPG forum and get some useful tips  and recommendations. Most of experts there are agree that there is no need for lubrication on this  engine.  Key to the success is choosing right components by good specialist, good installment  and very accurate regulations after that.