There are a multiplicity of oils on the market and they are rated into 3 grades, New up to 150,000kms (roughly), older and High performance engines.
If you have owned the car since new, changed the oil either on schedule or at least regularly, choose the one to suit the motor, standard or high performance, then on kilometres as per the speedo.
Add in your climate, car driven short, stop-start distances or more than 30 minutes at highway speed then the last choice is the cost and how pretty the container is !!
By Law all Oils that show the ASA marker must conform to a specific standard which means even the cheapest No Name Brands must at least work.
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