I did get help for my early message. What I did check compression test and find out 1, 2, and 4 has similar pressure 152 but 3 has 90. Now I need help what should I do? Should I go change whole engine?Car has 265000 miles already?I haven't change pcv valve yet but it isn't so hard I can do it tomorrow. My main problem was oil was linking from air filter?Back flow from engine breathing tube. Thank You for help
What is linking? Do you mean leaking? That compression difference is significant, but I would not bail on the engine yet. I would watch the way the engine behaves, keep check on the oil consumption, occasionally check the plug in the weak cylinder.