have you had anything done to the car (remap) i had that very same problem after i had my car remapped. i went back and they found there was a problem with the map.
to be honest i have no idea why people use longlife oil and then change it after 5000 miles. longlife oil normaly lasts about 18-20k miles (2years). castrol magnatec hense the name is made to bond to areas where the engine needs oil the most giveing good protection. castrol edge is meant to do...
you can use the "Right Oil for my car" on castorls website website to find the exact oil for your car. the link is: http://www.castrol.com/castrol/iframe.do?categoryId=9024084&contentId=7044829 im sure pretty that the oil to use on the s3 is a 5W-30 fully synthetic
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