Alright fellas. I know this discussion has been broughtup here a thousand times but I have a few extra questions. First, for those of you that use Seafoam, do you buy one for the tank and then another for the oil? A one pint container treats 10 quarts of oil so I figured I need two. One whole one for the tank and another half or so for the crankcase. And finally, which one would ya'll recommend? Two containers of Seafoam is $20 while a package of Zmax is $35. My car has 35,000 miles on it and has never had anything run through it to clean it. I figured it needs it. Thanks.