Oil reducing engines are very common in pakistan. The main causes of oil reduction are weak oil rings and pistons.
Rings and pistons wear out due to poor maintenance of engine and use of poor quality oil or fake oil(easly available in pakistan).
when you go to a local mechanic he will suggest you engine overhaul or ring piston replacement.
But purpose of this thread is to share my experience and research with you.
Experience:
We had a coure 2004 model, 147000 km driven, using ZIC hiflo 20w50, and off-course reducing oil(1 liter after every 3000 km).
and mechanic suggested us to overhaul engine. but i was not convinced because in other countries people try many options before going to over haul engine. Being an engineer i started researching to cure this problem.
Research:
After doing detailed research, I found that reduction of oil is not 100% fault of the engine. there are many small things
playing very important role. Like choice of the correct oil. and engine overhaul is not the rite choice.
Conclusion:
I came to the conclusion that fully synthetic API-SN standard oils are well formulated for these kind of issues.
I discussed it with my mechanic at toyota service center I-9 Islamabad about using fully synthetic oil in my
car but he said that these oils are very thin and will ruin the engine. and these oils are not for old cars.
but based on my research i took a risky decision to put ZIC fully synthetic API-SN 5w40 oil in my car.
I was amazed when i first started the engine, engine noise was reduced almost 70%, and after that i noticed improved
fuel economy and better pick.
Then i went to lahore via motorway to check the oil reduction issue.
But After running of 3000km NOT A SINGLE DROP OF OIL WAS REDUCED.
my mechanic was speechless, he said "sir jee mojza he ho gya hai".
But I knew it was not "mojza" its science of lubricants.
Now we have done 5 oil changes, first 3 was at 3000km and after that 5000km. and car is running very smoothly.
and not reducing oil.
Fully synthetic oils can solve oil reduction issue and save your engine and money.
because they are meant to do so.
Available Fully Synthetic oils:
ZIC XQ 5w40 API-SN (I used this one)
SHELL HELIX ULTRA 5w40 API-SN
CALTEX havoline fully synthetic 5w40 API-SN
My contact is 03452061642. feel free to contact.