hey all, ive been kinda following this off and on and i finally decided to try that pcv jar. well, i built it, install it and so far after two tanks of gas my mileage has stayed the same. now this is a 71 gm inline 250 with 31000 original miles on it. could it be that this engine just isnt producing that much blowby to be productive? when i unplug the pcv hose and run the engine i dont see fumes coming out like i did on my old Nova's inline. also, i read that a lesser quality oil may help the cracking, but wouldnt a worse oil increase friction and be bad for the internals of the engine? please,any help would be great.
