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Old 03-24-2010, 01:40 PM   #21
syr74
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Drives: Thunderbird
Join Date: Sep 2008
Location: Kentucky
Posts: 951
For those with a car still under warranty........I have seen warranty claims rejected (not by GM) for use of non-approved oils, it does happen and yes, if they think you are using something you shouldn't, they can and potentially will check.
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