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I've been using Royal Purple in my 91ZTT S3 since 95. It's well worth the money. The minute I changed over to it, the engine ran smoother and quieter. Sure, it's a few cents more expensive than Mobile 1, but isn't your Z worth it? Also, I only change my oil every 6K miles. Sounds crazy but when I have the oil examined, it's not any dirtier as long as I keep clean filters on it. So actually, for me, it's cheaper. Also, as a sidenote, Royal Purple is now officially recommended for the C5 corvette. Move over Mobile 1. Lee Lingo : Does anyone know if this stuff is good? My TT has 63k miles on it right now. The previous owner ran SA 30lb. which isnt doing my Z any favors... Im also in Texas.. : So is 10w30 syn royal purple good shit? : anyone run this? : Thanks : Joe
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