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I have a 3.2 VR6 in an Eos. And yes, they DO adjust both the intake and exhaust valve timing via oil pressure. Crazy, but true. So they're not trying to scam you.

Take it out on the highway and go for a long drive with the Seafoam in it. When safe and able to, mash the skinny pedal. Pretend you're "blowing out" the carburetor passages! LOL!

Your mechanic is correct. That may (hopefully) be enough to dissolve the crud in the oil passages.

This is why it is crucial to do regular oil changes (which as a mechanic I'm sure you do any way) and put the manufacturer's recommended oil in. Some people (not implicated you) don't and then wonder why their engine isn't running right with generic dino oil that is over a year old.
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