Hi rossstilwill,
All oil companies will advise you to follow manufacturer's recommendation and at the same time claim their oil can last up to 3 or 4 times the recommended mileage.
The choice is yours. I personally don't use synthetic oils for my own vehicles. Mineral based and replace them at recommended mileage with no additives.
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Saturday, March 7th, 2009 AT 7:36 AM