My khyber (on CNG)' 99 is consuming oil about 1 litre every 1000km.
Things i have done already:
1. Ensured that all seals are OK. Replaced main seal of engine and O ring at distributor. No more oil leaks.
2. Observed car on cold start, very very little blue smoke/smoke - indicating valve seals are OK.
3. Observed exhaust, no smell of Oil burning. But smell of CNG.
4. Switched to Petrol, observed exhaust again, no smell of oil but steam like exhaust.
In my opinion, engine is now weak and consuming oil slowly. I am using shell 10w40.
I was wondering if I can use 10w40 along with 20w50 in 50 50% quantity. Because I have read that 20w50 causes wear n tear to engine in long run.
What do u guys suggest?
Also advice if shall use shell fully synthetic?
@xulfiqar , the guru bhai. @all