they make specific MAF cleaner at your local auto parts store. Yes the seafoam will explain how to mix with gas and oil on the seafoam can. If you are doing the intake manifold, you take one third of a can and have the car suck it in through the brake booster vacuum line and let it soak in there for a while and then start it back up after fifteen minutes or so. It cleans everything out in there.........If you are going to do this there is more detailed instructions on other threads on here or videos of it on youtube........You do not mix this with the brake fluid......... I am not sure but I believe the original stock plugs are iridium which last a lot longer than copper(but some believe not perform as well) but not as long as platinum. I think iridium is rated for 50k but I dont know if they should really be in there that long or not( I wouldnt leave any plug in as long as rated) but the copper should only be ran for 10k max........but they are cheap.