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I never worry about oil too much EXCEPT when I'm at the track. I ALWAYS run a 50W then. I always ran the Euro 0W-40 off track because it was easy to get. Anyone who uses 5W-30 or 10W-40 will be just fine. You wont blow your engine up because of it. Yea, you'll reduce your cat life but I bet it will still last 80K miles or more. I never had a cat go bad before 100K miles personally.
Just be sure to ready yourself for the crying. Personally, I dont care.
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