zcp789 Posted March 17, 2008 Report Share Posted March 17, 2008 I have an '08 GT500. Do you all use / recommend the Ford recommendation of 5W-50? I have found that only Castrol Syntec and Motorcraft make that grade. And it's kinda hard to find. Was wondering if anyone was using 5W-40 or 30 instead, or if 5W-50 was a must. I live in Houston, so it never gets very cold, but gets plenty hot. Link to comment Share on other sites More sharing options...
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