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had the dealer flush my transmission for 30 dollars...put in the schaeffers synthetic and now after driving it for a while it shifts smoother and have been hand calc. 1 mpg more....ha ha
 

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Very good stuff!!! All there oils are great. We are a dealer for it & everyone I work with praise it. I got it front to back in my duramax! Good choice!!!:D
 

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when/if I EVER get my SC III put in I've got the same oil for mine.

been using schaeffer's since early 80's.
 
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