laubehcar, i assume from your posting you would like to know your options. so if you are still reading this forum these options available to you are as follows :-
a) a claim brought at the consumer claims tribunal for misrepresentation (of particulars associated to your vehicle). total sum of damages if awarded would NOT exceed RM25,000 as that is the statutorily defined limit of damages that may be awarded;
b) a civil suit claim in the local Sessions Court where the second hand dealer is located for the difference in price you paid (RM145,000 - MarketValue at Time of Purchase) PROVIDED ALWAYS THAT YOU SUCCESSFULLY PROVE YOU WERE BEING MISREPRESENTED by the dealer. the facts of the transaction carried out would be crucial to the success of your claim. Otherwise it would be counterproductive to bring an unsubstantiated claim having spent monies on the legal fees to being the action before the Courts. The English idiom "it would take a fool to spend good money on bad money" applies;
c) monetary consideration based on the economics of the second hand car market as well as the interests repayment of your loan would dictate (presumably) that to sell your vehicle at this time would cause you to suffer losses to a great degree. Assuming then that you have the resources to settle the difference in loan sum ie. (RM145,000 + interests) - proceeds of sale, then it would do you well to rid the vehicle off yourself. BUT, if cash is scarce, then i would suggest you take the advice of your fellow Forumers and maintain the vehicle. After all, they are singing praises for the E39 and that speaks volumes of the car you now own.