The appellant is engaged in the manufacture of additives for lubricating oil classifiable under Chapter 38 of the Central Excise Tariff Act, 1985. The appellant discharged duties of excise at the time of clearance of final products from their factory. The appellant availed CENVAT credit in respect of excise duty paid on inputs and capital goods and service tax paid on input service. Show Cause Notices dated 06.11.2007 and 04.06.2010 were issued by the Assistant Commissioner of Central Excise, Chennai, and Deputy Commissioner of Central Excise, Chennai, respectively demanding a sum of Rs.4,14,259/-and Rs.1,02,423/- being the CENVAT credit taken on inputs, which were not used in the manufacture of final products nor the said inputs were accounted for satisfactorily, as per Rule 9(5) of the Cenvat Credit Rules, during the periods from January 2007 to September 2007 and during the course of physical inventory undertaken on 31.03.2010. The appellant sent replies to the said Show Cause Notices stating that the shortage is due to heat, evaporation, handling loss and differences in measurement methodologies. After considering the replies of the appellant, the Deputy Commissioner of Central Excise, passed separate orders dated 28.03.2011 in order-in-original Nos.07/2011 and 06/2011 confirming the demand made in the Show Cause Notices with applicable rate of interest and also imposing penalty.