From the gm training video it should work amazing to keep oil out of the turbo and intercooler. There seems to be alot of thought put into it. I havent seen L5Ps oil the intercooler boots like older models.
If you had a power steering pressure tester yes but if not no.my gut tells me it is still the steering gear. That's what changed when the problem started.
I like the lml sensor. Mainly because I get all I want for free with cp4 failures. Just make sure to clean them when you taking it out of the old rail. Lml will read to 220mpa.