Looks like a minor oil leak sice it takes a month to detect. Plus, if your car is more than 5 years old and if its a proton car then, mostly likely friction is the cause for all these problem. Better to use semi-syn to protect further wear an tear. Go for check up and i recommend engine overhaul for those car running above 200K mileage.
~Just my 2 cents~
~Just my 2 cents~
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