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I just hit the 3,000 mile mark since I bought my 04 Mustang and wanted to know what's a good oil to use. The oil cap says 5W30 but with the heat here in Texas I'd think it would be better to use something thicker. My mechanic buddy said 10W40 but wouldn't 20W50 be best in the 105 degree heat we have here on a daily basis? Also, should I use regular dino or synthetic?