The engine size depends on the model of vehicle you are talking about. There are (and were) many different Lexus models, from the LS-430 luxury sedan to the RX-330 sporty SUV. For Lexus, the easy way to determine engine size is by model moniker. The 330 models have a 3.3 liter six cylinder, the GS and IS-300 have a 3.0 liter inline six cylinder, the GX-470 SUV has a 4.7 liter V-8, and the ES, GS, LS, and SC-430 have the 4.3 liter V-8. However, depending on the model of the car, the engine performance can vary drastically based on the design and level of trim. For decades the Ford Mustang and Crown Victoria has the same 5.0 liter V-8, but usually with a 100 horsepower difference between the two.
The 2012 Lexus IS-250 has a V6 engine.
The 2014 Lexus IS-250 has a V6 engine.
The 2009 Lexus IS-350 has a V6 engine.
The 2014 Lexus IS-350 has a V6 engine.
The 2009 Lexus IS-250 has a V6 engine.
The 2006 Lexus IS-350 has a V6 engine.
The 2008 Lexus IS-350 has a V6 engine.
The 2013 Lexus IS-350 has a V6 engine.
The 2012 Lexus IS-350 has a V6 engine.
The 2010 Lexus IS-250 has a V6 engine.
The 2011 Lexus IS-350 has a V6 engine.
The 2010 Lexus IS-F has a V8 engine.