Hey new guy here thanks for having me . Been lurking for a while its about time I join up. I got a1986 6.9l with a banks turbo that was recently purchased . It has some pretty bad blow by when the engine warms up but not so much when it's cold . Im just wondering what may cause blow by to get worse and not better while it warms up. It's really not too bad for the first couple minutes. I've done the oil cap test and it barely blows the cap off but it does knock it off. I know the engine may need some TLC but it runs excellent and starts within 2 or 3 seconds of cranking everytime.