hi got 3.3l having it LPG converted i have had 3 quotes from local garages that are on the registrar 2 want to put valve care system in it one say i must have the top electric feed jobbie at £200 + and the over garage said i dont need it but will fit it if i really want it at half price £35 is it wise to fit it any way as to have oil and not need it is not as bad as having none when it should