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i have read in the owners manual that you are not to use any fuel additive in the duramax's but would it be ok to use power service fuel additive once in awhile during the winter thanks
 

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There is a current TSB on additive usage in the Duramax diesel ....

Additive policy



Mac


On Edit : I'll let it hang (duplicate post) so Eric can give you his opinion if he desires .... Edited by: Mackin
 

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Stick with a good additive like FPPF, primrose or similer.. I think that both of them are good quality stuff, but Mac's link is GM's official view on the situation
 
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