I'm not so sure what they mean by "preferred companies", if your car is still under warrantee, the only thing that the warrantee will be voided after the conversion is the engine and fuel system. The rest of your car is still under warrantee. The newly installed lpg system also usually under 1 year warrantee, at least. Regardless of what branded system u installed, the dealer will have to service ur car as usual, nothing extra. If you need to service the conversion kit, just go back to the company where you get it installed. Personally, for the past 5 years, I have never serviced anything other than changing the LPG gas filter.
Most of the dealers are not servicing our car well, so now I choose to fix my car with private technician, he used to work for srinakarin dealer, a very efficient man he is. People using chevrolet often fix their car up with him. The only problem is that he cannot produce a VAT included bill, which makes the cars that own by companies don't want to fix their cars with him.
Last edited by Phenomenon; 04-12-2012 at 04:40 PM.