hi i have just bought a 1.9 vsx and the steering is very heavy i had a guy look at it, and says i need LHM oil but he won,t touch it, he is no mechanic but has good understanding off cars,i am going to buy the LHM oil from a main dealer,i am wondering if i can just top it up or do i have to flush out the old,citroen asks for silly money to change it.is this an easy job for a novice or should i just pay a dealer?????many thanks for any help..