Hi, i have an RX300 which was converted last year, the unit is a OMVL DREAM 21N multi point with a flash lube system attached to it, so the engine still gets enough oil residue on the valves & seats so they do not suffer valve burn, as LPG runs at a hotter & dryer temperature than Deisel/Petrol, but of course they both have oil in them in the first place.
I have had no problems & at 51p per ltr at a local propane gas supplier who also has an LPG station i just can't go wrong, even the big petrol stations sell for 62p which is still a hell of a saving.
hope this helps
Paul