mine blew smoke like crazy when i dripped it in through the intake, gas tank and oil didnt give me any smoke
That's what it was! I think I tried sucking it into the intake, but the engine died the second I unplugged the PCV.
I'm going to give the 928 the Seafoam treatment as soon as it comes out of hibernation...
I've used it in the crankcase and in the gas tank. I didn't notice much of a difference. I am going to do another treatment with my next oil change.
Bart