dear experts,
i own a mehran 2006 that has run 1.2k. Since a few months it has started decreasing oil. I use ZIC A, the oil reduces by around 1/3 at 3500km. (p.s i change oil, air filter and oil filter at around 3.5 to 4k). There is no smoke, not even in the morning. But on the tappet cover there accumulates oil smudge! I replaced the jaen of the tappet cover as well to make sure that it isn't the cause, but of no use. Last month due to my negligence it got heat up as well!!! I've been driving it since last 3 years and this was the first time it happened.
So i wanna ask should I go for overhauling or there may be something else can be done, what to check? Maybe just replace the gasket? What do you guys suggest? as presently i can't afford to buy a new one.