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Messages posted by: NERam
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The service bulletin back in July stated that you should change from using 5W-30 in your pickup to 5W-40. It also says a re-flash of the PCM and TCM is involved. Is it necessary to get the re-flash if you have the GDE Hot Tune and just start using 5W-40 oil? If so, would the GDE Hot Tune need need to be installed again after the re-flash?
 
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