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Don't Worry About Contamination.... But If You Switch To Sythetic Stick With It... For Me That Is The Best Way To Protect And Engine....my Girld Friend Had A 92 Tercel That Was Starting To Smoke. I Switch To Castrol Synthetic And We Put An Extra 50k On The Engine And The Engine Was Like Knew Until She Sold It. I Highly Recomend It !!! Try Not To Use Any Aditive That Will Thick The Oil They Are Not Good
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