So I have always liked to use Seafoam in my vehicles to help reduce carbon buildup. I add 1/3 of the can to the fuel tank, 1/3 to the oil, and the remaining directly into the throttle body. I posted a guide on another forum here..........
http://geometroforum.com/topic/681815/

I noticed these Volvo engines also produce a lot of carbon like the Suzuki engines I am familiar with. Does anyone here use this product to keep the engine clean?

 

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i didnt know u could add seafoam to your oil. never used the stuff but know people who do. doesn't it make all this crap come out your exhaust?

 

When added to the oil, it helps break up carbon deposits as it's run through. That is why I add it 500 miles before the next oil change because it gets black pretty fast if the car is loaded with carbon.

I can go 500 miles on 10 gallons of gas, so I add 1/3 part to the fuel tank. This helps break up carbon in the combustion chamber.

Pouring this stuff into the throttle body on a warm engine while it's running "shatters" the carbon deposits in the combustion chamber and valves similar to the water injection trick. I do the direct throttle body treatment right before the oil change.

I do not believe it additives like fuel injection cleaner and oil treatments. Seafoam is not an additive, it's a cleaner.