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I used a can of this stuff also in my old truck and it definitely made a difference, it was noticeable. Then I started wondering what it may do to gaskets and such so I stopped using it. Wouldn't want it building up in oil passageways. The engine ran fine before, during, and after so it didn't really need the stuff. On an old engine that is worn out and burning oil? Sure, I'd use Restore, probably right after running seafoam through the vacuum line as well.
On a side note. My '94 GMC Jimmy, I ran Seafoam through the vacuum line, oil, and fuel tank, and it put on a big smoke show. Shortly after, I pulled the top end apart. Partly because I was bored and partly because I wanted to hop up the 4.3 a bit and clean it up. I'm not sure if it was the seafoam doing it's job, but the top end was CLEAN and required almost no cleaning inside. Zero sludge, and the ports/intake valves had almost NO buildup.
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