C15 SDP Valve seals

What keeps putting oil in the cylinder? Turbo? How do you know? Bad air filter?
I thought valve seals were there to prevent to much oil from seeping down the stems. Causing a little oil usage or smoking on start up like old high mileage Chevys often did. Some engines did not come with valve stem seals and others only had them on the intake.The clearance between the stem and guide should be close enough to control pressure into the crankcase.
I also thought to much cylinder pressure blew head gaskets and or caused excessive cylinder temperatures.
Cannot talk about deletes here but I thank you are chasing the wrong horse.
We can talk about engine theory and the results of a malfunctioning IVA.

 

Valve seals on a CAT?

 

I was told on thesdp the effects on a malfunctioning iva setup are bad ...best to do a tune that uses the ivas ....lots of blown heads from "malfunctioning ivas"

 

Check out Larry's diesel in Frontenac KS ....great certified cat shop but also used to be a pdi dealer....only person that I allow in my engine anymore and is only 99 an hr