This shot says "V6VVT" on the engine cover.
So...is it the 3.6 or the new 4.3?? I've never seen a cover look like this for the 3.6 LFX engine. If it is the 3.6 the oil cap is always to the right of the intake throttle body and maybe it isn't visible in this shot...but I don't see it.
See the spy shot:
Versus the LFX in the Cadillac ATS