I have 2004 vxr cultus , 140k km odo, water dropping well mantained engine. Oil i have been using is caltex havoline formula 10w30 from a decade , which i change after 5 to 7k kms which cost me around 2200 . Now i am planning to switch to synthetic oil which hopefully will last 15k and costing around 3000. So from a broad perspective as per i am guessing i will be saving money on synthetic oil in long run.
So my question is the above mentioned theory of mine is either true or not ? And is it safe to use synthetic oil in a car which is 12 years old and already driven 142000 kms ?
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