With DI engines becoming more common, there is increasing concern about carbon buildup underneath the valves.
I have 10K miles on my Forester XT and I use a can of Seafoam every 2K miles. Probably doesn't do much for this problem. Any one have any direct visual experience of a method that works?
I have 10K miles on my Forester XT and I use a can of Seafoam every 2K miles. Probably doesn't do much for this problem. Any one have any direct visual experience of a method that works?