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Message: [QUOTE="powerlifter405, post: 1551913, member: 2044"] I noticed my 7.3 and 6.0 would start easier and run a bit quietier on syn vs dino oil, regardless of brand. The 7.3 regardless of syn brand would get louder as the miles wore on. Oil analysis at 10k always said it was good but I changed it and it was quieter again. My 6.0 hates dino in the winter, its a noisy bast%rd. Everyone has their opinion, oil analysis and life has shown me good clean oil is paramount regardless of brand. 315k original miles on the 6.0 using ford 15-40 or something similar and OEM filters, no top off needed between oil changes. [/QUOTE]

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