if u are getting oil in your filter body, then its definitely valve issue. one way to verify between piston ring and valve is to do wet compression test. First do a normal compression test and then squirt some oil from the top from spark plug hole and then do the compression test again if the value remain same then its the valves if it improves then its the rings. however doubt our mechanics can do it properly. 2nd mechanic is wrong. listen to first one, his rates seem a bit high, check plaza market for rates of genuine rings, valves and seats price then rest is labour charges shouldnt be more than 7k in my opinion including lathe machine work, which I think shouldn't be much if u replace valve and seats. Now if the car has been on cng then its the main culprit as high buring temp of cng burns away valves over time. secondly use of low quality oil or coolant also contribute to valve and valve seat failure. I can bet the previous owner knew abt the defect and like the cheats we are he decided to sell the jeenuin Car to you. just check filter assembly too if its bypassing filter then dirt can damage valves ans piston rings. once ur engine head is removed u can check cylinder walls for any scratches . there must a very light jaal type pattern it basically helps the oil film to stick on walls. i would recommend check ur filter body if its oil in it then its definitely your intake valve. but say it isnt it then you can remove head , change valves and seats then see the liner walls, if they are ok then proceed with the putting the head back with new seats and valves. if ur car doesnt reduces oil then good news if not then proceed with rings change.
Sent from my SAMSUNG-SM-G850A using PW Forums mobile app