totally confused as to what you are asking. If you want to know exactly which engine is in your car you can either look under the hood for a sticker or build plate that will show the engine code - which would look something like B5244S ( that then means its a 5 cylinder 2.4L etc). You can also use the VIN - there are plenty of online VIN decoders which will tell you the year of your car, the engine, (a two digit code - I think its position 6+7), your car's serial number etc. You should also do your buyers a favor and buy a carfax report for your car so you know what they are looking at.