ISX engine 800k miles burning oil

[SBTA]

Thx for replaying about 3 months ago my coolant tank start to leak so i checked the pressure in the system to be honest it was some pressure, but mechanics saying its normal, if i'm not wrong from (10 si 15 psi) but about crank case filter i need to replace to becouse its more than enough miles already on that filter... from what i heard usually if its bad worn inside is could have a strong dirty blow by and crank case filter its clogging out quick...but small amount of coolant i can be from the head gasket?
Yeah i'm agree they a not forever but any way its good to know for what you paying when you looking for a service.