Join Date: Apr 2017
Location: Tucson, AZ
Drives: Sorento LX V6 2018
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Seafoam is chemically similar to kerosene and does just about as much good. The only two additives tested by SAE that worked (and this was many years ago) were Techron CONCENTRATE (not the diluted fuel system treatment) and BG 44K (expensive and hard to find over the counter). If you use a top tier gasoline (which all the majors are, Costco is, Sam's club is) then you will never need to clean your injectors because it has Techron in the blend. If using a lesser grade of gas, throw a bottle of Techron Concentrate in every 6 months and you'll be fine.
As to cleaning the back of the intake valves - Seafoam will do absolutely nothing, the CRC product specifically for this purpose may work, not sure the jury is totally in yet. I've borescoped many an engine cylinder before and after a Seafoam treatment - water, creating steam, does a better job but is tricky to use due to the possibility of hydrolock. Even Techron, applied directly (which is NOT recommended), does not make much of a difference in carbon buildup on the pistons. Top tier gasoline, used exclusively, makes a huge difference on the piston face and used to make a difference on all valve surfaces in the days of MPI, not so much in GDI. GDI is going to require some type of separate treatment (like the CRC product) on a regular basis, just not sure that product or process is out there just yet although I did buy several cans of the CRC product.
Whenever the service writer says something is in the recommended maintenance procedure, pull out your maintenance handbook and politely ask them to point it out in the scheduled maintenance section. When they can't find it, politely ask them to stop misleading customers about what is and what is not required. If you have a particular complaint that is related to a non-maintenance item (like fuel injectors) then they may recommend a service to cure that problem, not because it's a required maintenance item.