ISX 475 oil leak

[s53s]

(02-05-2018 )s53s Wrote:  

(02-05-2018 )Rawze Wrote:  make sure the crank case can breathe well. Make sure the breather tube is clear and that nothing is trapped int he pipe. If there is a crank case filter, make sure it is clean, or it has been drilled out to prevent pressure buildup in the engine.

Thank you the pipe blows smoke while the truck idles meaning its open. We changed all filters but I'm not sure which one is the crank case filter also where can we drill, the driver says going up hill it loses power

With all due respect a friend just said to me Generation 1 ISX engines Dont have a crank case filter is this true?