The company had installed a waste oil tank in a machine room, which later released flammable vapours that reacted with electrical sparks produced during the operation of a lift, resulting in the blast.  SINGAPORE: A car company behind an explosion that tore through the wall of the Audi service centre in Ubi in 2023 was fined SS$12,000 (US$9,350) on Wednesday (Sep 10). The blast on Mar 7, 2023 had been caused by the reaction between electric sparks produced from the use of a lift and flammable