The cheaper costing engine for the SRX is the 3.6 liter V6 engine. This engine offers sound performance and good fuel economy for a six cylinder engine. The 3.6 liter motor is exclusive for the SRX only in design. The upgraded engine is the redesigned 4.6 liter Northstar V8. When power is an issue and money is not, this is the upgrade a buyer should have in mind. The next generation SRX offers a 2.8 turbocharged engine, a 3.0 liter mid-level V6 and the higher power 3.6 liter engine. Below is a list of the current engines used for the Cadillac SRX : 3.6 L LY7 HFV6 V6 4.6 L LH2 Northstar V8 2.8 L LP9 V6 (turbocharged gasoline) 3.0 L LF1 V6 (gasoline) 3.6 L LFX V6 (gasoline/E85)