so i hopped on the seafoam band wagon after reading great things about it. just put some in the gas tank this morning. i was reading on the back of the bottle that you can add it to the oil/crankcase and some in the spark plugs. it also talked about putting it in the air cleaner for a "fog affect". has anyone done either of these? i was doin some searching here and i didn't see too many threads that talked about oil or spark plugs. i have not noticed a difference yet, but im sure i will in the next few days.