The Philippines explains the $12 cost to have a Mechanic do the valve adjustment.
My Wife (12 years now) is from the Philippines and I have spent about 60 days there. During that time every car (especially Taxies) I rode in had badly slipping clutches and a multitude of other problems. The impression that I got is that if the vehicle moves at all nothing is going to be fixed.
My Wife also tells me that unless a Doctor did something extremely out of line (like Murder) there is not even possible to sue for malpractice in the Philippines.

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84 300D, 82 Volvo 244Gl Diesel