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Bighorn 550


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Just purchased the  Bighorn 550 explorer,after the breakin period what engine oil and diff fluid are you using?ive read about using a motorcycle engine oil or just a 10w40 blend?and differentials,states a 80/90 gl5,is there something preferred over another?is there a better spark plug than the K6RTC? just want to start out doing it correctly,im a true believer in proper maintenance,thanks for any contribution

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