Hi guys, I put mystery oil treatment in my oil and gas tank. I was told by many people this stuff is the best. I ran it through a 94 bmw 325i and 94 mustang 6 cyl. Both cars are seeming to run bad. Both run pretty much like crap. It said on the bottle that its poured into oil and gas tank and it cleans everything. Whats going on here? Im kinda pissed off.