possibly a newbie!

[jim.2007]

Hi just sold my tvr and after an m5 e39 I think, looking at some next weekend, what models are the best for oil consumption, 1999 or the 2001 updated versions, i'm getting from friends it's hit and miss on either, and how much is an lpg coversion? if any one has had one done? as would like to run it as a main car for the next 2 years atleast, any helpful tips appreciated before I view an 1999 and 2001 model shortley
Thank's in advance
Jim