I am new to this site and i was just wounder which oil is better royal purple or Castrol SYNTEC. I do my oil change every 5 thounsand miles. Is royal purple worth the extra money. i live in Michigan and my car sits out side at night.
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I believe it is called, 'german' castrol, not european formula, if i am not mistaken.
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So is Castrol Syntec oil just as good as rp. I do a lot of short driving trips to work and back it is like 3 miles. I also heard the Castrol sytec is not true synthetic.