Engine Oil Decrease
Dear members I need an advice regarding Engine Oil Decrease.
I have been noticing from past few oil changes that there is a decrease of Engine oil ranging from 500ml to 750ml. Initially I started with Zic A then moved to Zic A+ at third time. Then moved back to Zic A after two oil changes because there was more oil decrease in case of Zic A+. I have been using Zic Customer centre Nishat (Near DHA, Lahore).
I have checked with few mechanics and they say that Engine is weak (Ring pistons). However one good mechanic said that it is because of Zic oil only.
Usually I change oil after 3,800 to 4,000 km.
Could you guys please suggest me what to do. And how I can make sure that engine is weak.
My car is 77,000km driven. And I am surprised, why engine is weak and how it happened because I have been using it quite gently.
Thanks in advance for your suggestions.