you have to provide more detail regarding this issue.
1. is your car decreasing a large amount of oil?
2. do you observe blue smoke from your exhaust while driving?
3. is the exhaust black and it has traces of oil in it?
if your car has the above syptoms you must go for an overhaul.
and if the oil is decreasing in a small amount say .25 to .5litre per 3000km and u observe smoke only at startups and not after that. get the valve seals replaced only....
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